APA (7e ed.) Bronvermelding

Sheffield, L. J. (2003). Extending the challenge in mathematics: Developing mathematical promise in K-8 students. Corwin Press.

Chicago (17e ed.) Bronvermelding

Sheffield, Linda Jensen. Extending the Challenge in Mathematics: Developing Mathematical Promise in K-8 Students. Thousand Oaks, CA: Corwin Press, 2003.

MLA (8e ed.) Bronvermelding

Sheffield, Linda Jensen. Extending the Challenge in Mathematics: Developing Mathematical Promise in K-8 Students. Corwin Press, 2003.