Cita APA (7a ed.)

Dineen, M., & Polley, R. L. (1965). Herbert Hoover's challenge to America, his life and words. Country Beautiful Foundation.

Cita Chicago Style (17a ed.)

Dineen, Michael, y Robert L. Polley. Herbert Hoover's Challenge to America, His Life and Words. Wisconsin: Country Beautiful Foundation, 1965.

Cita MLA (8a ed.)

Dineen, Michael, y Robert L. Polley. Herbert Hoover's Challenge to America, His Life and Words. Country Beautiful Foundation, 1965.