Παραπομπή APA

Wallis, C. (1973). Parctical zoology for advanced level and intermediate students. (6th ed.). William Heinemann Medical Books, Limited..

Παραπομπή Chicago Style

Wallis, Cj. Parctical Zoology for Advanced Level and Intermediate Students. 6th ed. London: William Heinemann Medical Books, Limited., 1973.

Παραπομπή MLA

Wallis, Cj. Parctical Zoology for Advanced Level and Intermediate Students. 6th ed. William Heinemann Medical Books, Limited., 1973.