APA (7th ed.) Citation

Dr.Seuss. (1957). The cat in the hat (1st.). Harper collins.

Chicago Style (17th ed.) Citation

Dr.Seuss. The Cat in the Hat. 1st. London: Harper collins, 1957.

MLA (9th ed.) Citation

Dr.Seuss. The Cat in the Hat. 1st. Harper collins, 1957.

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