APA (7th ed.) Citation

Woolard, S. B. (1940). An improved method of obtaining data for retaration curves. [publisher not identified].

Chicago Style (17th ed.) Citation

Woolard, Simon Brown. An Improved Method of Obtaining Data for Retaration Curves. (College Station, Texas): [publisher not identified], 1940.

MLA (9th ed.) Citation

Woolard, Simon Brown. An Improved Method of Obtaining Data for Retaration Curves. [publisher not identified], 1940.