Gopal, Madan (1990). K.S. Gautam (ред.). India through the ages. Publication Division, Ministry of Information and Broadcasting, Government of India. с. 78.
Mead, G. R. S. (1906). Thrice-Greatest Hermes. Т. 3. London & Benares: The Theosophical Publishing Society. с. 133—134. OCLC76743923.
Bodhi, ред. (1995). 28, Mahāhatthipadopamasutta. The Middle Length Discourses of the Buddha: a New Translation of the Majjhima Nikaya. Boston: Wisdom Publications in association with the Barre Center for Buddhist Studies. ISBN0-86171-072-X. OCLC31331607.
Anuruddha (1993). Bodhi (ред.). A Comprehensive Manual of Abhidhamma: the Abhidhammattha Sangaha of Ācariya Anuruddha. Kandy, Sri Lanka: Buddhist Publication Society. с. 260. ISBN955-24-0103-8. OCLC33088951. Thus as fourfold the Tathagatas reveal the ultimate realities-consciousness, mental factors, matter, and Nibbana.