APA (7th ed.) Citation

Dr. Seuss. (2008). One fish, two fish, red fish, blue fish. HarperCollins childrens books.

Chicago Style (17th ed.) Citation

Dr. Seuss. One Fish, Two Fish, Red Fish, Blue Fish. UK: HarperCollins childrens books, 2008.

MLA (9th ed.) Citation

Dr. Seuss. One Fish, Two Fish, Red Fish, Blue Fish. HarperCollins childrens books, 2008.

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