Παραπομπή σε μορφή APA (7η εκδ.)

Cooper, J. D. (1986). A Trip Through Time: Principle Of Historical Geology. Merril Publishing Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Cooper, John D. A Trip Through Time: Principle Of Historical Geology. Merril Publishing Company, 1986.

Παραπομπή σε μορφή MLA (8th εκδ.)

Cooper, John D. A Trip Through Time: Principle Of Historical Geology. Merril Publishing Company, 1986.