APA (7th ed.) Citation

Gardner, E. S. (1943). The D.A. draws a circle. Triangle books.

Chicago Style (17th ed.) Citation

Gardner, Erle Stanley. The D.A. Draws a Circle. New York: Triangle books, 1943.

MLA (9th ed.) Citation

Gardner, Erle Stanley. The D.A. Draws a Circle. Triangle books, 1943.