Cita APA (7th ed.)

Goodchild, P. Oppenheimer (1a. ed.). Salvat.

Cita Chicago (17th ed.)

Goodchild, Peter. Oppenheimer. 1a. ed. Barcelona: Salvat.

Cita MLA (9th ed.)

Goodchild, Peter. Oppenheimer. 1a. ed. Salvat.