APA (7th ed.) Citation

Fulghum, R. (1990). All I really need to know I learned in kindergarten: The essay that became a classic. Villard Books.

Chicago Style (17th ed.) Citation

Fulghum, Robert. All I Really Need to Know I Learned in Kindergarten: The Essay That Became a Classic. New York: Villard Books, 1990.

MLA (9th ed.) Citation

Fulghum, Robert. All I Really Need to Know I Learned in Kindergarten: The Essay That Became a Classic. Villard Books, 1990.