Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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