Abe Ryūichi, The Weaving of Mantra, Columbia University Press, New York 1999.
Davidson Ronald, Indian Esoteric Buddhism: A Social History of the Tantric Movement, Columbia University Press, New York 2002.
Grela Joanna, Przekazywanie niewyrażalnego. Przykład tybetańskich inicjacji [Passing Down the Inexpressible. Example of Tibetan Empowerments], “The Polish Journal of the Arts and Culture”, 2/2012.
Jamgon Kongtrul, Buddhist Ethics, Snow Lion Publications, Ithaca 2003.
Jamgon Kongtrul, Systems of Buddhist Tantra, Snow Lion Publications, Ithaca 2005.
Lessing F. D., Wayman Alex, Introduction to the Buddhist Tantric System, Motilal Banarsidass Publishers, Delhi 1978.
Tenga Rinpocze, Sutry i Tantry, Wydawnictwo “Góry”, Kraków 1994.
Samuel Geoffrey, The Origins of Yoga and Tantra, Cambridge University Press, Cambridge 2008.
Yamasaki Taikō, Shingon. Japanese Esoteric Buddhism, Shambhala, Boston 1998.
Suggested lectures:
Payne Richard, Tantric Buddhism in East Asia, Wisdom Publications, Boston 2006.
Tsenshap Kirti, Priciples of Buddhist Tantra, Wisdom Publications, Boston 2011.
Unno Mark, Shingon Refractions, Wisdom Publications, Boston 2004. 
Abbreviations:
KE – Kindle Edition