APA (7th ed.) Citation

Dorling Kindersley Limited. (2015). When on Earth?: History as you've never seen it before (First American edition.). DK Publishing.

Chicago Style (17th ed.) Citation

Dorling Kindersley Limited. When on Earth?: History as You've Never Seen It Before. First American edition. New York, New York: DK Publishing, 2015.

MLA (8th ed.) Citation

Dorling Kindersley Limited. When on Earth?: History as You've Never Seen It Before. First American edition. DK Publishing, 2015.

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