Cita APA (7a ed.)

Robinson, R., & Jackson, I. J. (1984). People on earth: Human geography. Longman.

Cita Chicago Style (17a ed.)

Robinson, Roger, y I. J. Jackson. People on Earth: Human Geography. Harlow, Essex, England: Longman, 1984.

Cita MLA (9a ed.)

Robinson, Roger, y I. J. Jackson. People on Earth: Human Geography. Longman, 1984.