Borror A. C., Hill B. F. (1995) The order Euplotida (Ciliophora): Taxonomy, with division of Euplotes into several genera. J. Eukaryot. Microbiol. 42: 457–466

Dieckmann J. (1995) An improved protargol impregnation for ciliates yielding reproducible results. Europ. J. Protistol. 31: 372–382

Dragesco J. (1996) Infraciliature et morphométrie de cinq espèces de ciliés mésopsammiques méditerranéens. Cah. Biol. Mar. 37: 261–293

Fernandez-Galiano D. (1976) Silver impregnation of ciliated protozoa: procedure yielding good results with the pyridinated silver carbonate method. Trans. Am. Microsc. Soc. 95: 557–560

Fernandez-Galiano D. (1994) The ammoniacal silver carbonate method as a general procedure in the study of protozoa from sewage (and other) waters. Wat. Res. 28: 495–495

Foissner W. (2014) An update of ‘basic light and scanning electron microscopic methods for taxonomic studies of ciliated protozoa’. Int. J. System. Evol. Microbiol. 64: 271–292

Foissner W., Berger H., Blatterer H., Kohmann F. (1995) Taxonomische und ökologische Revision der Ciliaten des Saprobiensystems. Band IV: Gymnostomatea, Loxodes, Suctoria. – Informationsberichte des Bayerischen Landesamtes für Wasserwirtschaft, 1/95: 1–540

Foissner W., Wilbert N. (1981) A comparative study of the infraciliature and silverline system of the fresh-water scuticociliates Pseudocohnilembus putrinus (Kahl, 1928) nov. comb., P. pusillus (Quennerstedt, 1869) nov. comb., and the marine form P. marinus Thompson, 1966. J. Protozool. 28: 291–297

Foley J. O. (1943) A protargol method for staining nerve fibers in frozen or celloidin sections. Stain Techn. 18: 27–33

Hu X., Song W. (2003) Redescription of the morphology and divisional morphogenesis of the marine hypotrich Pseudokahliella marina (Foissner et al., 1982) from scallop-culture water of North China. J. Nat. Hist. 37: 2033–2043

Jankowski A.V. (1967) A systematic of the genus Chilodonella and the proposed new genus Trithigmostoma gen. n. Zool. J. 46: 1247–1250 (In Russian with English summary)

Kahl A. (1930–1935) Urtiere oder Protozoa. I: Wimpertiere oder Ciliata (Infusoria), eine Bearbeitung der freilebenden und ectocommensalen Infusorien der Erde, unter Ausschluss der marinen Tintinnidae. In F. Dahl (Ed.), Die Tierwelt eutschlands (Pt. 18 (year 1930), 21 (1931), 25 (1932), 30 (1935)). Jena: G. Fischer: 1–886

Klein B. M. (1958) The “dry” silver method and its proper uses. J. Protozool. 5: 99–103

Lynn D. (1992) Protargol staining. In: Protocols in protozoology (Eds. J. J. Lee and A. T. Soldo). Society of Protozoologists, Allen Press Inc.: C4.1–4.8

Lynn D. H., Montagnes D. J. S., Dale T., Gilron G. L., Strom S. L. (1991) A reassessment of the genus Strombidinopsis (Ciliophora, Choreotrichida) with descriptions of four new planktonic species and remarks on its taxonomy and phylogeny. J. Mar. Biol. Ass. U.K. 71: 597–612

Ma H., Choi J. K., Song W. (2003) An improved silver carbonate impregnation for marine ciliated protozoa. Acta Protozool. 42: 161–164

Montagnes D. J. S., Lynn D. H. (1987) A Quatitative Protargol Stain (QPS) for ciliates: method description and test of its quantitative nature. Marine Microb. Food Webs 2: 83–93

Pan X., Bourland W. A., Song W. (2013) Protargol Synthesis: An In-House Protocol. J. Eukaryot. Microbiol. 60: 609–614

Peters A. (1958) Staining of nervous tissue by protein-silver mixtures. Stain Techn. 33: 47–53

Petz W. (1999) Ciliophora. In: South Atlantic Zooplankton I, (Ed. Demetrio Boltovskoy). Backhuys Publishers, Leiden: 265–319

Schewiakoff W. T. (1886) Organization and Systematic of Infusoria Aspirotricha (Holotricha auctorum) // Proc. Imperial Acad. Sc. St. Petersburg, 4: 1–395 (In Russian)

Silva-Neto I. D. da (2000) Improvement of silver impregnation technique (protargol) to obtain morphological features of protists ciliates, flagellates and opalinates Rev. Brasil. Biol. 60: 451–459

Skibbe O. (1994) An improved quantitative protargol stain for ciliates and other planktonic protists. Arch. Hydrobiol. 130: 339–347

Song W., Petz W., Warren A. (2001) Morphology and morphogenesis of the poorly-known marine urostylid ciliate, Metaurostylopsis marina (Kahl, 1932) nov. gen., nov. comb. (Protozoa, Ciliophora, Hypotrichida). Europ. J. Protistol. 37: 63–76

Tuffrau M. (1960) Révision du genre Euplotes, fondée sur la comparaison des structures superficielles. Hydrobiologia 15: 1–77

Tuffrau M. (1967) Perfectionements et pratique de la techinique d’impregnatiom au protargol des infusoires cilies. Protistologica 3: 369–399

Wicklow B. J., Hill B. F. (1992) A short procedure for protargol staining In: Protocols in protozoology (Eds. J. J. Lee and A. T. Soldo). Society of Protozoologists, Allen Press Inc.: C5.1–5.4