एपीए उद्धरण

Leathart, G. L. (1975). National Coal Board Medical Service Annual Report 1972-73.

शिकागो स्टाइल उद्धरण

Leathart, G. L. National Coal Board Medical Service Annual Report 1972-73. 1975.

एमएलए उद्धरण

Leathart, G. L. National Coal Board Medical Service Annual Report 1972-73. 1975.