Cita APA (7a ed.)

Knox, D., & Smith, B. J. (1993). Human geography: A world perspective. Harcourt Brace Jovanovich.

Cita Chicago Style (17a ed.)

Knox, David, y Barry J. Smith. Human Geography: A World Perspective. Toronto: Harcourt Brace Jovanovich, 1993.

Cita MLA (9a ed.)

Knox, David, y Barry J. Smith. Human Geography: A World Perspective. Harcourt Brace Jovanovich, 1993.