Nāgārjuna (c. 150 – c. 250 CE) was an important Buddhist philosopher - sometimes called "the second Buddha." He and disciple Āryadeva founded the Madhyamaka school of Mahāyāna Buddhism. Nāgārjuna is also credited with developing the philosophy of the Prajñāpāramitā sūtras. Some sources credit him with having recovered these verses from the nāgas (snake-people).
- "Nagarjuna" in Wikipedia.
- "Nagarjuna" in Stanford Encyclopedia of Philosophy.
- "Nagarjuna (c. 150—c. 250) in Internet Encyclopedia of Philosophy.
- "Causality and Emptiness: The Wisdom of Nagarjuna" by Peter Della Santina in BuddhaNet.net.