Παραπομπή APA

Subramanian, S. (1977). Bio-gas systems in Asia. Development Insititute.

Παραπομπή Chicago Style

Subramanian, S.K. Bio-gas Systems in Asia. New Delhi: Development Insititute, 1977.

Παραπομπή MLA

Subramanian, S.K. Bio-gas Systems in Asia. Development Insititute, 1977.