APA استشهاد

Harmer, S., & Shipley, A. (1968). Cambridge natural history: Birds. Today And Tommorow.

استشهاد بنمط شيكاغو

Harmer, S.F, و A.E Shipley. Cambridge Natural History: Birds. New Delhi: Today And Tommorow, 1968.

MLA استشهاد

Harmer, S.F, و A.E Shipley. Cambridge Natural History: Birds. Today And Tommorow, 1968.