Polley, R. L. (1965). Herbert Hoover's: Challenge to America. His life and words (1a. ed.). Country Beautiful Foundation.
Цитирование в стиле Чикаго (17-е изд.)Polley, Robert L. Herbert Hoover's: Challenge to America. His Life and Words. 1a. ed. Nueva York: Country Beautiful Foundation, 1965.
Цитирование MLA (9-е изд.)Polley, Robert L. Herbert Hoover's: Challenge to America. His Life and Words. 1a. ed. Country Beautiful Foundation, 1965.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.