Παραπομπή APA

Sylvester-Bradley, P. C. (1956). Species concept in palaeontology ([1st ed.].).

Παραπομπή Chicago Style

Sylvester-Bradley, P. C. Species Concept in Palaeontology. [1st ed.]. London, 1956.

Παραπομπή MLA

Sylvester-Bradley, P. C. Species Concept in Palaeontology. [1st ed.]. 1956.