APA (7th ed.) Citation

Leroy-Beaulieu, P. (1907). The United States in the twentieth century (2. ed.). Funk & Wagnalls.

Chicago Style (17th ed.) Citation

Leroy-Beaulieu, Pierre. The United States in the Twentieth Century. 2. ed. New York: Funk & Wagnalls, 1907.

MLA (9th ed.) Citation

Leroy-Beaulieu, Pierre. The United States in the Twentieth Century. 2. ed. Funk & Wagnalls, 1907.