Singh, R. B. (1974). Bio-gas plant: Generating methane from organic wastes. Gobar Gas Research Station.
Chicago-referens (17:e uppl.)Singh, Ram Bux. Bio-gas Plant: Generating Methane from Organic Wastes. Ajitmal, Etawah: Gobar Gas Research Station, 1974.
MLA-referens (8:e uppl.)Singh, Ram Bux. Bio-gas Plant: Generating Methane from Organic Wastes. Gobar Gas Research Station, 1974.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.