Hoffmann, J. R. (1970). Stretchers and shrinkers ; Activities handbook Book 1-4. Harper and Row Publishers.
芝加哥风格引文Hoffmann, Joseph R. Stretchers and Shrinkers ; Activities Handbook Book 1-4. New York: Harper and Row Publishers, 1970.
MLA引文Hoffmann, Joseph R. Stretchers and Shrinkers ; Activities Handbook Book 1-4. Harper and Row Publishers, 1970.
警告：这些引文格式不一定是100％准确.