Citazione Stile APA (7a Edizione)

Hoover, H. C. (1934). The Challenge to liberty. Scribner's.

Citazione stile Chigago Style (17a edizione)

Hoover, Herbert Clark. The Challenge to Liberty. New York: Scribner's, 1934.

Citatione MLA (9a ed.)

Hoover, Herbert Clark. The Challenge to Liberty. Scribner's, 1934.