APA (7th ed.) Citation

Roethke, T. (1961). I am! says the lamb. Doubleday.

Chicago Style (17th ed.) Citation

Roethke, Theodore. I Am! Says the Lamb. Garden City, N. Y: Doubleday, 1961.

MLA (9th ed.) Citation

Roethke, Theodore. I Am! Says the Lamb. Doubleday, 1961.