Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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