APA (7th ed.) Citation

Little, J., & Truesdell, S. (1989). Hey world, here I am! Harper & Row.

Chicago Style (17th ed.) Citation

Little, Jean, and Sue Truesdell. Hey World, Here I Am! [New York]: Harper & Row, 1989.

MLA (8th ed.) Citation

Little, Jean, and Sue Truesdell. Hey World, Here I Am! Harper & Row, 1989.