APA aipamena

Douglas, H. (1967). Hotel-keeping and catering. Robert Hale.

Chicago Style aipamena

Douglas, Hugh. Hotel-keeping and Catering. London: Robert Hale, 1967.

MLA aipamena

Douglas, Hugh. Hotel-keeping and Catering. Robert Hale, 1967.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.