APA (7th ed.) Citation

Lankford, M. D., & Dugan, K. (2002). Birthdays around the world. HarperCollins.

Chicago Style (17th ed.) Citation

Lankford, Mary D., and Karen Dugan. Birthdays Around the World. [New York]: HarperCollins, 2002.

MLA (8th ed.) Citation

Lankford, Mary D., and Karen Dugan. Birthdays Around the World. HarperCollins, 2002.

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