APA (7th ed.) Citation

(1999). 20th century day by day. Dorling Kindersley.

Chicago Style (17th ed.) Citation

20th Century Day by Day. London: Dorling Kindersley, 1999.

MLA (9th ed.) Citation

20th Century Day by Day. Dorling Kindersley, 1999.

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