Citazione APA

Berenstain, S., & Berenstain, J. (1999). The Berenstain Bears and the big question. Random House.

Stile di citazione Chicago

Berenstain, Stan, e Jan Berenstain. The Berenstain Bears and the Big Question. New York: Random House, 1999.

Citazione MLA

Berenstain, Stan, e Jan Berenstain. The Berenstain Bears and the Big Question. Random House, 1999.