APA (7th ed.) Citation

Zieleniewicz, A., & Schmidt, S. (1973). Polen (o.A.). Interpress.

Chicago Style (17th ed.) Citation

Zieleniewicz, Andrzej, and Siegfried Schmidt. Polen. o.A. Warschau: Interpress, 1973.

MLA (8th ed.) Citation

Zieleniewicz, Andrzej, and Siegfried Schmidt. Polen. o.A. Interpress, 1973.

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