The sleepytime book /
by Jan Wahl ; pictures by Arden Johnson.

APA Citation

Wahl, J., Johnson-Petrov, A. (1992). The sleepytime book. New York: Tambourine Books.

MLA Citation

Wahl, Jan, and Arden Johnson-Petrov. The Sleepytime Book. New York: Tambourine Books, 1992.

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