Świątczak, P. (2017). 
	The correspondence between Marian Gieszczykiewicz and his fiancée and a wife-to-be, Elżbieta Schreyer, from a private collection of Ann Elizabeth Gieszczykiewicz- Jaron – the history of the set and its historical and sentimental value. The Annual of the Scientific Library of the PAAS and the PAS in Cracow, 2017, 177-208. doi: https://doi.org/