APA (7th ed.) Citation

Welty, E., & Sharp, R. A. (1991). The Norton book of friendship. Norton.

Chicago Style (17th ed.) Citation

Welty, Eudora, and Ronald A. Sharp. The Norton Book of Friendship. New York: Norton, 1991.

MLA (9th ed.) Citation

Welty, Eudora, and Ronald A. Sharp. The Norton Book of Friendship. Norton, 1991.