Παραπομπή σε μορφή APA (7η εκδ.)

Hanger, E. O., & Lowe, P. S. (1937). Directed studies in biology: A combined workbook and labroatory manual. Mentzer, Buch and Co..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hanger, Ernest O., και Paul S. Lowe. Directed Studies in Biology: A Combined Workbook and Labroatory Manual. New York : Chicago: Mentzer, Buch and Co., 1937.

Παραπομπή σε μορφή MLA (8th εκδ.)

Hanger, Ernest O., και Paul S. Lowe. Directed Studies in Biology: A Combined Workbook and Labroatory Manual. Mentzer, Buch and Co., 1937.