APA (7th ed.) Citation

Brooks, P. S., & Walworth, N. Z. (1966). The world of walls: The Middle Ages in Western Europe. Lippincott.

Chicago Style (17th ed.) Citation

Brooks, Polly Schoyer, and Nancy Zinsser Walworth. The World of Walls: The Middle Ages in Western Europe. Philadelphia: Lippincott, 1966.

MLA (9th ed.) Citation

Brooks, Polly Schoyer, and Nancy Zinsser Walworth. The World of Walls: The Middle Ages in Western Europe. Lippincott, 1966.