APA (7th ed.) Citation

Bell, E. T. (1990). The last problem. The Mathematical Association of America.

Chicago Style (17th ed.) Citation

Bell, Eric Temple. The Last Problem. Washington, D.C: The Mathematical Association of America, 1990.

MLA (9th ed.) Citation

Bell, Eric Temple. The Last Problem. The Mathematical Association of America, 1990.

Warning: These citations may not always be 100% accurate.