Παραπομπή APA

Johnston, B. L., & Richman, F. (1997). Numbers and symmetry: An introduction to algebra. CRC Press.

Παραπομπή Chicago Style

Johnston, Bernard L., και Fred Richman. Numbers and Symmetry: An Introduction to Algebra. Boca Raton: CRC Press, 1997.

Παραπομπή MLA

Johnston, Bernard L., και Fred Richman. Numbers and Symmetry: An Introduction to Algebra. CRC Press, 1997.