APA aipamena

(1981). Keyboard. [Cupertino, Calif.]: [GPI Publications].

Chicago Style aipamena

Keyboard. [Cupertino, Calif.]: [GPI Publications], 1981.

MLA aipamena

Keyboard. [Cupertino, Calif.]: [GPI Publications], 1981.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.