APA (7th ed.) Citation

O'Connor, J., & Hammond, T. (2016). What were the Twin Towers? Grosset & Dunlap.

Chicago Style (17th ed.) Citation

O'Connor, Jim, and Ted Hammond. What Were the Twin Towers? New York: Grosset & Dunlap, 2016.

MLA (8th ed.) Citation

O'Connor, Jim, and Ted Hammond. What Were the Twin Towers? Grosset & Dunlap, 2016.

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