APA (7th ed.) Citation

Elwell, C. F. (1923). The Poulsen arc generator. van Nostrand.

Chicago Style (17th ed.) Citation

Elwell, Cyril F. The Poulsen Arc Generator. New York: van Nostrand, 1923.

MLA (9th ed.) Citation

Elwell, Cyril F. The Poulsen Arc Generator. van Nostrand, 1923.