APA استشهاد

Sharma, R. C. (1986). Environmental education (2nd revised ed.). Metropolitan.

استشهاد بنمط شيكاغو

Sharma, R. C. Environmental Education. 2nd revised ed. New Delhi: Metropolitan, 1986.

MLA استشهاد

Sharma, R. C. Environmental Education. 2nd revised ed. Metropolitan, 1986.