एपीए उद्धरण

Tonkinson, E. (1962). Commercial apprentieeships. London.

शिकागो स्टाइल उद्धरण

Tonkinson, Ernest. Commercial Apprentieeships. University of London: London, 1962.

एमएलए उद्धरण

Tonkinson, Ernest. Commercial Apprentieeships. London, 1962.