Cita APA (7a ed.)

Hornby, W., & Jones, M. (1990). An introduction to population geography. University Press.

Cita Chicago Style (17a ed.)

Hornby, William, y Melvyn Jones. An Introduction to Population Geography. Cambridge: University Press, 1990.

Cita MLA (9a ed.)

Hornby, William, y Melvyn Jones. An Introduction to Population Geography. University Press, 1990.