↑"Greek as well as Iranian influences appear to have shaped the evolution of Mahayana images (and perhaps thought as well)". Foltz, Richard, Religions of the Silk Road, Palgrave Macmillan, 2nd edition, 2010, p. 46 ISBN978-0-230-62125-1
Echoes of Alexander the Great: Silk route portraits from Gandhara by Marian Wenzel, with a foreword by the Dalai Lama (Eklisa Anstalt, 2000) ISBN1-58886-014-0
"When the Greeks Converted the Buddha: Asymmetrical Transfers of Knowledge in Indo-Greek Cultures" by Georgios T. Halkias, In Trade and Religions: Religious Formation, Transformation and Cross-Cultural Exchange between East and West, ed. Volker Rabens. Brill Publishers, 2013: 65-115.
The Edicts of King Asoka: An English Rendering by Ven. S. Dhammika (The Wheel Publication No. 386/387) ISBN955-24-0104-6
Mahayana Buddhism, The Doctrinal Foundations, Paul Williams, Routledge, ISBN0-415-02537-0