Παραπομπή APA

Frings, H. (1970). Concepts of zoology. The Macmillan company.

Παραπομπή Chicago Style

Frings, Hubert. Concepts of Zoology. London: The Macmillan company, 1970.

Παραπομπή MLA

Frings, Hubert. Concepts of Zoology. The Macmillan company, 1970.