Babson, R. W. (1933). Fighting business depressions: How to overcome operating losses in your business. Harper & Brothers.
Lua i Stíl Chicago (17ú heag.)Babson, Roger W. Fighting Business Depressions: How to Overcome Operating Losses in Your Business. New York: Harper & Brothers, 1933.
Lua MLA (9ú heag.)Babson, Roger W. Fighting Business Depressions: How to Overcome Operating Losses in Your Business. Harper & Brothers, 1933.
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