Catlin, G. E. G. (1934). Preface to action. New York: The Macmillan company.
Trích dẫn kiểu ChicagoCatlin, George Edward Gordon. Preface to Action. New York: The Macmillan company, 1934.
Deismireacht MLACatlin, George Edward Gordon. Preface to Action. New York: The Macmillan company, 1934.
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