APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

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