Watkins, R. J. (1927). Ohio employment studies. Bureau of business research, Ohio state university.
Chicago-viite (17. p.)Watkins, Ralph J. Ohio Employment Studies. Columbus, O.: Bureau of business research, Ohio state university, 1927.
MLA-viite (8. p.)Watkins, Ralph J. Ohio Employment Studies. Bureau of business research, Ohio state university, 1927.
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