APA-referens (7:e uppl.)

Hart, W. L. (1969). Essentials of algebra. Prindle, Weber and Schmidt, Inc.

Chicago-referens (17:e uppl.)

Hart, William L. Essentials of Algebra. Boston, Massachusetts: Prindle, Weber and Schmidt, Inc, 1969.

MLA-referens (9:e uppl.)

Hart, William L. Essentials of Algebra. Prindle, Weber and Schmidt, Inc, 1969.