APA (7th ed.) Citation

Ziefert, H. Hey, baby it's time to come out. Blue Apple Books.

Chicago Style (17th ed.) Citation

Ziefert, Harriet. Hey, Baby It's Time to Come Out. Maplewood: Blue Apple Books.

MLA (9th ed.) Citation

Ziefert, Harriet. Hey, Baby It's Time to Come Out. Blue Apple Books.