Cita APA (7a ed.)

Pickles, T., & Mackay, J. (1961). The world at work: An introduction to social and economic geography. Murray.

Cita Chicago Style (17a ed.)

Pickles, Thomas, y John Mackay. The World at Work: An Introduction to Social and Economic Geography. London: Murray, 1961.

Cita MLA (9a ed.)

Pickles, Thomas, y John Mackay. The World at Work: An Introduction to Social and Economic Geography. Murray, 1961.