APA (7th ed.) Citation

Ketchum, R. M., & Plumb, J. H. (1961). Horizon book of the Renaissance.

Chicago Style (17th ed.) Citation

Ketchum, Richard M., and J. H. Plumb. Horizon Book of the Renaissance. 1961.

MLA (9th ed.) Citation

Ketchum, Richard M., and J. H. Plumb. Horizon Book of the Renaissance. 1961.

Warning: These citations may not always be 100% accurate.