APA (7th ed.) Citation

Paulsen, F. (1928). Proportionality chart. Electric Journal, 25, 416.

Chicago Style (17th ed.) Citation

Paulsen, F. "Proportionality Chart." Electric Journal 25 (1928): 416.

MLA (9th ed.) Citation

Paulsen, F. "Proportionality Chart." Electric Journal, vol. 25, 1928, p. 416.

Warning: These citations may not always be 100% accurate.