Cita APA

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

Chicago Edition Citation

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

Cita MLA

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