- "Cooperation in England" by George Iles in Popular Science Monthly, 17 (October 1880)
- "Co-operation," by Aneurin Williams in Encyclopædia Britannica (11th ed., 1911)
- "Co-operation," in Collier's New Encyclopedia, New York: P. F. Collier & Son Co. (1921)
- "Coöperation," by Leonard Sidney Woolf in Encyclopædia Britannica (12th ed., 1922)
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