Cita APA (7a ed.)

Crewe, R. J., Ludbrook, J. A., & Massey, D. (1990). Our world: Discovering patterns in human geography. Heath.

Cita Chicago Style (17a ed.)

Crewe, R. James, Jenifer A. Ludbrook, y Donald Massey. Our World: Discovering Patterns in Human Geography. Toronto: Heath, 1990.

Cita MLA (9a ed.)

Crewe, R. James, et al. Our World: Discovering Patterns in Human Geography. Heath, 1990.