APA (7th ed.) Citation

Ellis, J., & Peacock, P. H. (2004). What's your angle, Pythagoras?: A math adventure. Charlesbridge.

Chicago Style (17th ed.) Citation

Ellis, Julie, and Phyllis Hornung Peacock. What's Your Angle, Pythagoras?: A Math Adventure. Watertown, MA: Charlesbridge, 2004.

MLA (9th ed.) Citation

Ellis, Julie, and Phyllis Hornung Peacock. What's Your Angle, Pythagoras?: A Math Adventure. Charlesbridge, 2004.