Παραπομπή APA

Romer, A. (1971). Vertibrate paleontology (3rd ed.). University of Chicago Press.

Παραπομπή Chicago Style

Romer, Alfred. Vertibrate Paleontology. 3rd ed. Chicogo: University of Chicago Press, 1971.

Παραπομπή MLA

Romer, Alfred. Vertibrate Paleontology. 3rd ed. University of Chicago Press, 1971.