APA (7th ed.) Citation

Danziger, P., & Martin, A. M. (1998). P.S. longer letter later. Scholastic Press.

Chicago Style (17th ed.) Citation

Danziger, Paula, and Ann M. Martin. P.S. Longer Letter Later. New York: Scholastic Press, 1998.

MLA (9th ed.) Citation

Danziger, Paula, and Ann M. Martin. P.S. Longer Letter Later. Scholastic Press, 1998.