Cita APA (7th ed.)

Sharma, P. D. (1985). Elements of ecology (5th.). Rastogi Publications.

Cita Chicago (17th ed.)

Sharma, P. D. Elements of Ecology. 5th. Meerut: Rastogi Publications, 1985.

Cita MLA (9th ed.)

Sharma, P. D. Elements of Ecology. 5th. Rastogi Publications, 1985.