Pattis, R. E., Roberts, J., & Stehlik, M. (1995). Karel the robot: A gentle introduction to the art of programming (2nd ed.). Wiley.
芝加哥风格引文Pattis, Richard E., Jim Roberts, 与 Mark Stehlik. Karel the Robot: A Gentle Introduction to the Art of Programming. 2nd ed. New York: Wiley, 1995.
MLA引文Pattis, Richard E., et al. Karel the Robot: A Gentle Introduction to the Art of Programming. 2nd ed. Wiley, 1995.
警告：这些引文格式不一定是100％准确.