एपीए उद्धरण

Gennard, J. (1976). Economic and technologicl environments 3. Open University Press.

शिकागो स्टाइल उद्धरण

Gennard, John. Economic and Technologicl Environments 3. England: Open University Press, 1976.

एमएलए उद्धरण

Gennard, John. Economic and Technologicl Environments 3. Open University Press, 1976.