Cita APA (7th ed.)

Leopold, R. W., & Link, A. S. (1957). Problems in American history (2nd ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Leopold, Richard William, i Arthur Stanley Link. Problems in American History. 2nd ed. Englewood Cliffs, N.J: Prentice-Hall, 1957.

Cita MLA (9th ed.)

Leopold, Richard William, i Arthur Stanley Link. Problems in American History. 2nd ed. Prentice-Hall, 1957.