APA (7th ed.) Citation

ebrary, Inc, Henle, M., & Hopkins, B. (2012). Martin Gardner in the twenty-first century. Mathematical Association of America.

Chicago Style (17th ed.) Citation

ebrary, Inc, Michael Henle, and Brian Hopkins. Martin Gardner in the Twenty-first Century. Washington, D.C.: Mathematical Association of America, 2012.

MLA (9th ed.) Citation

ebrary, Inc, et al. Martin Gardner in the Twenty-first Century. Mathematical Association of America, 2012.