APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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