APA (7th ed.) Citation

(2000). 20th century day by day ([Updated ed.].). Dorling Kindersley.

Chicago Style (17th ed.) Citation

20th Century Day by Day. [Updated ed.]. London: Dorling Kindersley, 2000.

MLA (9th ed.) Citation

20th Century Day by Day. [Updated ed.]. Dorling Kindersley, 2000.