APA-referens (7:e uppl.)

Recco, W. (2002). 501 algebra questions. Learning Express.

Chicago-referens (17:e uppl.)

Recco, William. 501 Algebra Questions. New York: Learning Express, 2002.

MLA-referens (9:e uppl.)

Recco, William. 501 Algebra Questions. Learning Express, 2002.