Peg Hall. (2002). "Whose Eyes Are These?: A Look at Animal Eyes - Big, Round, and Narrow (Whose Is It?)". Picture Window Books.
Chicago-viite (17. p.)Peg Hall. "Whose Eyes Are These?: A Look at Animal Eyes - Big, Round, and Narrow (Whose Is It?)". Picture Window Books, 2002.
MLA-viite (9. p.)Peg Hall. "Whose Eyes Are These?: A Look at Animal Eyes - Big, Round, and Narrow (Whose Is It?)". Picture Window Books, 2002.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.