Gustav Roth, Bhikṣuṇī-Vinaya, K. P. Jayaswal Research Institute (Patna 1970), pp. 55, 251.
Gregory Schopen, On Emptying Chamber Pots without Looking and the Urban Location of Buddhist Nunneries in Early India Again, Journal Asiatique, vol. 296, no. 2 (2008), pp. 229-256, at p. 247.