Cita APA (7th ed.)
Valentine, J. (1988). Puppies. GMP.
Cita Chicago (17th ed.)
Valentine, John. Puppies. [London]: GMP, 1988.
Cita MLA (9th ed.)
Valentine, John. Puppies. GMP, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.