एपीए उद्धरण

(1997). Karel ++: A gentle introduction to the art of object-oriented programming. New York: John Wiley and Sons, Inc.

शिकागो स्टाइल उद्धरण

Karel ++: A Gentle Introduction to the Art of Object-oriented Programming. New York: John Wiley and Sons, Inc, 1997.

एमएलए उद्धरण

Karel ++: A Gentle Introduction to the Art of Object-oriented Programming. New York: John Wiley and Sons, Inc, 1997.