APA (7th ed.) Citation

States, U. (1952). The Katyn Forest Massacre. U.S. Govt. Print. Off..

Chicago Style (17th ed.) Citation

States, United. The Katyn Forest Massacre. U.S. Govt. Print. Off., 1952.

MLA (8th ed.) Citation

States, United. The Katyn Forest Massacre. U.S. Govt. Print. Off., 1952.

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