Singh, R. B. (1974). Bio-gas plant: Generating methane from organic wastes. Gobar Gas Research Station.
Dyfyniad Arddull ChicagoSingh, Ram Bux. Bio-gas Plant: Generating Methane from Organic Wastes. Ajitmal, Etawah: Gobar Gas Research Station, 1974.
Dyfyniad MLASingh, Ram Bux. Bio-gas Plant: Generating Methane from Organic Wastes. Gobar Gas Research Station, 1974.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.