APA (7th ed.) Citation

Brett, J. (2002). Who's that knocking on Christmas Eve? G.P. Putnam.

Chicago Style (17th ed.) Citation

Brett, Jan. Who's That Knocking on Christmas Eve? New York: G.P. Putnam, 2002.

MLA (8th ed.) Citation

Brett, Jan. Who's That Knocking on Christmas Eve? G.P. Putnam, 2002.

Warning: These citations may not always be 100% accurate.