L. S. Cousins, “On the Vibhajjavadins: The Mahimsasaka, Dhammaguttaka, Kassapiya and Tambapanniya branches of the ancient Theriyas”, BSRV, vol. 18, no. 2, pp. 131–182, May 2001, doi: 10.1558/bsrv.v18i2.14449.