Cita APA (7th ed.)
ebrary, Inc, Henle, M., & Hopkins, B. (2012). Martin Gardner in the twenty-first century. Mathematical Association of America.
Cita Chicago (17th ed.)
ebrary, Inc, Michael Henle, i Brian Hopkins. Martin Gardner in the Twenty-first Century. Washington, D.C.: Mathematical Association of America, 2012.
Cita MLA (9th ed.)
ebrary, Inc, et al. Martin Gardner in the Twenty-first Century. Mathematical Association of America, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.