Roy, A.K., “Review of low cost sanitation technologies in India : revised assignment report (Oct. 15, 1989 to Dec. 29, 1989 limited to 16 working days)”. S.n., S.l., p. 83 p. : ill., 1989.

Singh, R.S. and Roy, A.K., “Development and implementation of low-cost sanitation investment projects : report on mission to Nepal : September 15-22, 1984”, vol. TAG/NEP/10. World Bank, Washington, DC, USA, p. 11 p.: tab., 1984.

Roy, A.K., Chatterjee, P.K., Gupta, K.N., Khare, S.T., Rau, B.B., and Singh, R.S., “Manual on the design, construction and maintenance of low-cost pour-flush waterseal latrines in India”, vol. no. 10. World Bank, Washington, DC, USA, p. iii, 109 p. : tab., techn. drawing, 1984.

Singh, R.S., Roy, A.K., Chatterjee, P.K., Gupta, K.N., Khare, S.T., and Rau, B.B., “Manuel de conception, de construction et d'entretien de latrines bon marche a siphon et a rincage manuel en Inde”, vol. no. 10. World Bank, Washington, DC, USA, p. xiv, 111 p.: techn. drawings, tab., 1983.