Παραπομπή σε μορφή APA (7η εκδ.)

Safko, J. L. (1994). Instructor's manual for Hartmann and Impey's astronomy: The cosmic journey (5th edition.). Wadsworth Publishing Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Safko, John L. Instructor's Manual for Hartmann and Impey's Astronomy: The Cosmic Journey. 5th edition. Belmont, Ca: Wadsworth Publishing Company, 1994.

Παραπομπή σε μορφή MLA (8th εκδ.)

Safko, John L. Instructor's Manual for Hartmann and Impey's Astronomy: The Cosmic Journey. 5th edition. Wadsworth Publishing Company, 1994.