APA Style

Parker, Steve. (1995). I Wonder Why : Tunnels Are Round . New York :: Grolier.

Chicago Style

Parker, Steve. I Wonder Why : Tunnels Are Round. New York :: Grolier, 1995. Text.

MLA Style

Parker, Steve. I Wonder Why : Tunnels Are Round. New York :: Grolier, 1995. Text.

Turabian Style

Parker, Steve. I Wonder Why : Tunnels Are Round. New York :: Grolier, 1995. Print.