Cita APA (7a ed.)

Davies, G. J., & Gray, R. (1985). Purchasing international freight services. Gower.

Cita Chicago Style (17a ed.)

Davies, G. J., y R. Gray. Purchasing International Freight Services. Aldershot [etc.]: Gower, 1985.

Cita MLA (9a ed.)

Davies, G. J., y R. Gray. Purchasing International Freight Services. Gower, 1985.