Cita APA (7th ed.)

Chang, G., & Sederberg, T. W. (1997). Over and over again. Mathematical Association of America.

Cita Chicago (17th ed.)

Chang, Gengzhe, i Thomas W. Sederberg. Over and over Again. Washington, DC: Mathematical Association of America, 1997.

Cita MLA (9th ed.)

Chang, Gengzhe, i Thomas W. Sederberg. Over and over Again. Mathematical Association of America, 1997.