APA (7th ed.) Citation

Cumming, W. P., Quinn, D. B., & Skelton, R. A. (1972). The discovery of North America. American Heritage Publishing Co., Inc.

Chicago Style (17th ed.) Citation

Cumming, W. P., D. B. Quinn, and R. A. Skelton. The Discovery of North America. New York: American Heritage Publishing Co., Inc, 1972.

MLA (8th ed.) Citation

Cumming, W. P., et al. The Discovery of North America. American Heritage Publishing Co., Inc, 1972.