Παραπομπή σε μορφή APA (7η εκδ.)

Unknown. Dr. Philip J. Hornung, Biology Professor and Coordinator of University Planning at Xavier University of Louisiana.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Unknown. Dr. Philip J. Hornung, Biology Professor and Coordinator of University Planning at Xavier University of Louisiana.

Παραπομπή σε μορφή MLA (8th εκδ.)

Unknown. Dr. Philip J. Hornung, Biology Professor and Coordinator of University Planning at Xavier University of Louisiana.