Cita APA (7a ed.)

Ziefert, H., & Bolam, E. (1998). A polar bear can swim: What animals can and cannot do. Viking.

Cita Chicago Style (17a ed.)

Ziefert, Harriet, y Emily Bolam. A Polar Bear Can Swim: What Animals Can and Cannot Do. New York: Viking, 1998.

Cita MLA (8a ed.)

Ziefert, Harriet, y Emily Bolam. A Polar Bear Can Swim: What Animals Can and Cannot Do. Viking, 1998.

Precaución: Estas citas no son 100% exactas.