एपीए उद्धरण

Gupta, O. P. (1981). Chemical Engineering: Objective Type Questions and Answer. Khanna Publishers.

शिकागो स्टाइल उद्धरण

Gupta, Om Prakash. Chemical Engineering: Objective Type Questions and Answer. Delhi: Khanna Publishers, 1981.

एमएलए उद्धरण

Gupta, Om Prakash. Chemical Engineering: Objective Type Questions and Answer. Khanna Publishers, 1981.