Cita APA (7th ed.)

Laude, P., & Cooper, C. (1988). Polo norte, polo sur. SM.

Cita Chicago (17th ed.)

Laude, Patrick, i Charlie Cooper. Polo Norte, Polo Sur. Madrid: SM, 1988.

Cita MLA (9th ed.)

Laude, Patrick, i Charlie Cooper. Polo Norte, Polo Sur. SM, 1988.