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R. K. Farnsworth, Barrett, E. C., et Dhanju, M. S.,
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A. G. Lane,
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G. DeWolf, Murin, P., Jarvis, J., et Kelly, M.,
« The cost digest : cost summaries of selected environmental control technologies ». US Environmental Protection Agency (EPA), Washington, DC, USA, p. xii, 92 p.: fig., tab., 1984.
D. D. Mara,
« The design of ventilated improved pit latrines », vol. no. 13. World Bank, Washington, DC, USA, p. iii, 73 p. : fig., ill., tab., 1984.
J. S. MacNeill et MacNeill, A.,
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O. P. Handa,
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