APA aipamena

Berenstain, J., & Berenstain, M. (2007). Trim the tree. Harper Festival.

Chicago Style aipamena

Berenstain, Jan, and Mike Berenstain. Trim the Tree. New York: Harper Festival, 2007.

MLA aipamena

Berenstain, Jan, and Mike Berenstain. Trim the Tree. Harper Festival, 2007.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.