एपीए उद्धरण

Perkins, G. D. (1971). The principles of electrical science in SI units. English Universities press.

शिकागो स्टाइल उद्धरण

Perkins, G D. The Principles of Electrical Science in SI Units. London: English Universities press, 1971.

एमएलए उद्धरण

Perkins, G D. The Principles of Electrical Science in SI Units. English Universities press, 1971.