APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

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