Cita APA (7a ed.)

ALEXANDER, J. W., & GIBSON, L. J. (1979). Economic geography.-- ed.2. Prentice Hall.

Cita Chicago Style (17a ed.)

ALEXANDER, John W., y Lay James GIBSON. Economic Geography.-- Ed.2. London: Prentice Hall, 1979.

Cita MLA (9a ed.)

ALEXANDER, John W., y Lay James GIBSON. Economic Geography.-- Ed.2. Prentice Hall, 1979.