Werner, Karel. “The Yogasutras of Patañjali on Concentration of Mind. Fernando Tola and Carmen Dragonetti. Translated from the Revised Spanish Original by K. D. Prithpaul”. Buddhist Studies Review, vol. 6, no. 1, June 1989, pp. 93-97, https://doi.org/10.1558/bsrv.v6i1.15906.