APA
"United Nations E. A. s. C. F. A. A. T. P., "United Nations E. A. s. C. F. A. A. T. P., . (1980). Guid book on biogas development. New: York United Nations U S A.
Chicago
"United Nations Economic And social Commission For Asia And The Pacific", "United Nations Economic And social Commission For Asia And The Pacific", . 1980. Guid book on biogas development. New: York United Nations U S A.
Harvard
"United Nations E. A. s. C. F. A. A. T. P., "United Nations E. A. s. C. F. A. A. T. P., . (1980). Guid book on biogas development. New: York United Nations U S A.
MLA
"United Nations Economic And social Commission For Asia And The Pacific", "United Nations Economic And social Commission For Asia And The Pacific", . Guid book on biogas development. New: York United Nations U S A. 1980.
