एपीए उद्धरण

Pattis, R. E. (1981). Karel the robot: A gentle introdcution to the art of programming. John Wiley and Sons.

शिकागो स्टाइल उद्धरण

Pattis, Richard E. Karel the Robot: A Gentle Introdcution to the Art of Programming. New York: John Wiley and Sons, 1981.

एमएलए उद्धरण

Pattis, Richard E. Karel the Robot: A Gentle Introdcution to the Art of Programming. John Wiley and Sons, 1981.