↑ Akira Hirakawa, Paul Groner, A history of Indian Buddhism: from Śākyamuni to early Mahāyāna. Reprint published by Motilal Banarsidass Publ., 1993, page 2.
↑ Guang Xing. The Concept of the Buddha: Its Evolution from Early Buddhism to the Trikaya Theory. 2004. pp. 65–66"Several scholars have suggested that the Prajñāpāramitā probably developed among the Mahasamghikas in Southern India, in the Andhra country, on the Krsna River."
↑ The New York times guide to essential knowledge: a desk reference for the curious mind. Macmillan 2004, page 513.
