APA aipamena

Campbell, J. A. (1939). Relative Value of Hearing Aids.

Chicago Style aipamena

Campbell, J. Argyll. Relative Value of Hearing Aids. 1939.

MLA aipamena

Campbell, J. Argyll. Relative Value of Hearing Aids. 1939.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.