APA (7th ed.) Citation

Backus, O. P. (1963). The problems of unity in the Polish-Lithuanian state.

Chicago Style (17th ed.) Citation

Backus, Oswald Prentiss. The Problems of Unity in the Polish-Lithuanian State. 1963.

MLA (9th ed.) Citation

Backus, Oswald Prentiss. The Problems of Unity in the Polish-Lithuanian State. 1963.

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