A boy, a dog, a frog, and a friend /
by Mercer and Marianna Mayer.

APA Citation

Mayer, M., Mayer, M. (1971). A boy, a dog, a frog, and a friend. New York: Dial Press.

MLA Citation

Mayer, Mercer, 1943-, and Marianna Mayer. A Boy, a Dog, a Frog, And a Friend. New York: Dial Press, 1971.

Warning: These citations may not always be complete (especially for serials).