Cita APA (7th ed.)

Sharma, P. D. (1975). Elements of ecology. Rastogi Publications.

Cita Chicago (17th ed.)

Sharma, P. D. Elements of Ecology. Meerut: Rastogi Publications, 1975.

Cita MLA (9th ed.)

Sharma, P. D. Elements of Ecology. Rastogi Publications, 1975.