APA (7th ed.) Citation

Mills, H. (1992). Twentieth century world history in focus. Nelson.

Chicago Style (17th ed.) Citation

Mills, Harry. Twentieth Century World History in Focus. Walton-on-Thames: Nelson, 1992.

MLA (9th ed.) Citation

Mills, Harry. Twentieth Century World History in Focus. Nelson, 1992.

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