APA (7th ed.) Citation

Wells, D. (2014). Contest Problem Book IX: American Mathematics Competitions (AMC 12) 2001-2007. Mathematical Association of America.

Chicago Style (17th ed.) Citation

Wells, David. Contest Problem Book IX: American Mathematics Competitions (AMC 12) 2001-2007. Washington: Mathematical Association of America, 2014.

MLA (9th ed.) Citation

Wells, David. Contest Problem Book IX: American Mathematics Competitions (AMC 12) 2001-2007. Mathematical Association of America, 2014.

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