APA (7th ed.) Citation

Langdale, F. D. (1940). Structural problems in connection with panel heating. [publisher not identified].

Chicago Style (17th ed.) Citation

Langdale, Frederick Darrow. Structural Problems in Connection with Panel Heating. (College Station, Texas): [publisher not identified], 1940.

MLA (9th ed.) Citation

Langdale, Frederick Darrow. Structural Problems in Connection with Panel Heating. [publisher not identified], 1940.