Fay, C. R. (1925). Co-operation at home and abroad: A description and analysis, with supplements on The progress of co-operation in the United Kingdom (1908-1918) and Agricultural co-operation in the Canadian west (3rd ed.). P.S. King & son.

Fay, C. R. Co-operation at Home and Abroad: A Description and Analysis, with Supplements on The Progress of Co-operation in the United Kingdom (1908-1918) and Agricultural Co-operation in the Canadian West. 3rd ed. P.S. King & son, 1925.