Bradley, J. T., & Guthrie, J. A. (1953). An analysis of convention business in Washington State: A sample survey of five cities. State College of Washington, School of Economics and Business, Bureau of Economic Research.
Chicago-referens (17:e uppl.)Bradley, Joseph Thomas, och John Alexander Guthrie. An Analysis of Convention Business in Washington State: A Sample Survey of Five Cities. Pullman: State College of Washington, School of Economics and Business, Bureau of Economic Research, 1953.
MLA-referens (8:e uppl.)Bradley, Joseph Thomas, och John Alexander Guthrie. An Analysis of Convention Business in Washington State: A Sample Survey of Five Cities. State College of Washington, School of Economics and Business, Bureau of Economic Research, 1953.
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