APA (7th ed.) Citation

Tierney, B. (1970). The Middle Ages. Knopf.

Chicago Style (17th ed.) Citation

Tierney, Brian. The Middle Ages. New York: Knopf, 1970.

MLA (9th ed.) Citation

Tierney, Brian. The Middle Ages. Knopf, 1970.

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