http://redzambala.com/buddhism/buddha-aspects/ratnasambhava-wisdom-of-equality-and-abundance.html
Shih, Tao-tsi.
The Sutra of Bodhisattva Ksitigarbha's Fundamental Vows (2nd ed.).
Sutra Translation Committee of the United States and Canada.
p. 63.

Meeting the Buddhas By Vessantara.
Windhorse Publications, 2004.
ISBN 0-904766-53-5 pg 84
Hackin, Joseph.
Asiatic Mythology 1932.
Books.google.com.
p. 428.
Retrieved 2013-06-14.
http://redzambala.com/buddhism/buddha-aspects/ratnasambhava-wisdom-of-equality-and-abundance.html
Shih, Tao-tsi. The Sutra of Bodhisattva Ksitigarbha's Fundamental Vows (2nd ed.). Sutra Translation Committee of the United States and Canada. p. 63.
Meeting the Buddhas By Vessantara. Windhorse Publications, 2004. ISBN 0-904766-53-5 pg 84
Hackin, Joseph. Asiatic Mythology 1932. Books.google.com. p. 428. Retrieved 2013-06-14.
Ratnasambhava