Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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