एपीए उद्धरण

Open Universityscience Foundation Course Team & Open University, S. F. (1975). Major features of the earths surface. Open University Press.

शिकागो स्टाइल उद्धरण

Open Universityscience Foundation Course Team और Science Founda Open University. Major Features of the Earths Surface. Open University Press, 1975.

एमएलए उद्धरण

Open Universityscience Foundation Course Team और Science Founda Open University. Major Features of the Earths Surface. Open University Press, 1975.