APA Edition Citation

Erwin Brecher & Mike Gerrard. (2009). Challenging Science Puzzles. Goodwill Publishing House.

Chicago Edition Citation

Erwin Brecher and Mike Gerrard. Challenging Science Puzzles. New delhi: Goodwill Publishing House, 2009.

MLA Edition Citation

Erwin Brecher and Mike Gerrard. Challenging Science Puzzles. Goodwill Publishing House, 2009.

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