Cita APA (7th ed.)

Sharma, P. D. (2013). Ecology and environment (11th rev. ed.). Rastogi Publications.

Cita Chicago (17th ed.)

Sharma, P. D. Ecology and Environment. 11th rev. ed. Meerut: Rastogi Publications, 2013.

Cita MLA (9th ed.)

Sharma, P. D. Ecology and Environment. 11th rev. ed. Rastogi Publications, 2013.