APA (7th ed.) Citation

Yolen, J., Aesop, & Barbour, K. (1995). A sip of Aesop. Blue Sky Press.

Chicago Style (17th ed.) Citation

Yolen, Jane, Aesop, and Karen Barbour. A Sip of Aesop. New York: Blue Sky Press, 1995.

MLA (9th ed.) Citation

Yolen, Jane, et al. A Sip of Aesop. Blue Sky Press, 1995.