APA (7th ed.) Citation

Ryan, D. (2003). The United States and Europe in the twentieth century. Pearson/Longman.

Chicago Style (17th ed.) Citation

Ryan, David. The United States and Europe in the Twentieth Century. Harlow, England ; New York: Pearson/Longman, 2003.

MLA (9th ed.) Citation

Ryan, David. The United States and Europe in the Twentieth Century. Pearson/Longman, 2003.