APA (7th ed.) Citation

Cumming, W. P., Skelton, R. A., & Quinn, D. B. (1971). The discovery of North America. Elek.

Chicago Style (17th ed.) Citation

Cumming, W. P., R. A. Skelton, and David B. Quinn. The Discovery of North America. London: Elek, 1971.

MLA (8th ed.) Citation

Cumming, W. P., et al. The Discovery of North America. Elek, 1971.