Παραπομπή σε μορφή APA (7η εκδ.)

RICHARDS, R. (1991). An Early Start To Ourselves And Evolution With Life Processes Roy Richards. Simon and Schuster.

Παραπομπή σε μορφή Chicago (17η εκδ.)

RICHARDS, Roy. An Early Start To Ourselves And Evolution With Life Processes Roy Richards. Simon and Schuster, 1991.

Παραπομπή σε μορφή MLA (8th εκδ.)

RICHARDS, Roy. An Early Start To Ourselves And Evolution With Life Processes Roy Richards. Simon and Schuster, 1991.