Dyfyniad APA

METCALF,EDDY. (1979). WESTE WATER ENGG. TREATMENT DISPOSAL REFUSAL. TMH.

Dyfyniad Arddull Chicago

METCALF,EDDY. WESTE WATER ENGG. TREATMENT DISPOSAL REFUSAL. TMH, 1979.

Dyfyniad MLA

METCALF,EDDY. WESTE WATER ENGG. TREATMENT DISPOSAL REFUSAL. TMH, 1979.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.