APA (7th ed.) Citation

Barnes, H. E. (1984). Who started the first World War? Institute for Historical Review.

Chicago Style (17th ed.) Citation

Barnes, Harry Elmer. Who Started the First World War? Costa Mesa, CA: Institute for Historical Review, 1984.

MLA (9th ed.) Citation

Barnes, Harry Elmer. Who Started the First World War? Institute for Historical Review, 1984.

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