Παραπομπή APA

Spemann, H. (1967). Embryonic development and induction. Hafner Press.

Παραπομπή Chicago Style

Spemann, H. Embryonic Development and Induction. Newyork: Hafner Press, 1967.

Παραπομπή MLA

Spemann, H. Embryonic Development and Induction. Hafner Press, 1967.