APA (7th ed.) Citation

Halecki, O., & Polonsky, A. (1978). A history of Poland. Kegan Paul.

Chicago Style (17th ed.) Citation

Halecki, Oskar, and Antony Polonsky. A History of Poland. London: Kegan Paul, 1978.

MLA (8th ed.) Citation

Halecki, Oskar, and Antony Polonsky. A History of Poland. Kegan Paul, 1978.

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