C. K. Sharma,
«Chemical pollution of the soil and groundwater in the Kingdom of Nepal», vol. no. 173. IAHS Press, Institute of Hydrology, Wallingford, UK, pp. p. 391-397: 3 fig., 4 tab., 1990.
M. Strauss,
«Food from waste»,
World health forum, pp. p. 46-59: fig., photogr., tab., 1990.