Gopal, Madan (1990). K.S. Gautam (ed.). India through the ages. Publication Division, Ministry of Information and Broadcasting, Government of India. p. 192.
Crow, John L (July–October 2012). "Thought Forms: A Bibliographic Error"(PDF). Theosophical History: A Quarterly Journal of Research. 16 (3–4): 126–127. Archived from the original(PDF) on 3 October 2022. Retrieved 3 October 2022.
Crow, John L (July–October 2012). "Thought Forms: A Bibliographic Error"(PDF). Theosophical History: A Quarterly Journal of Research. 16 (3–4): 126–127. Archived from the original(PDF) on 3 October 2022. Retrieved 3 October 2022.