Pennsylvania State College. Bureau of Business Research. (1949). Bulletin of the Pennsylvania State College Bureau of Business Research. The Bureau.
Lua i Stíl Chicago (17ú heag.)Pennsylvania State College. Bureau of Business Research. Bulletin of the Pennsylvania State College Bureau of Business Research. State College: The Bureau, 1949.
Lua MLA (8ú heag.)Pennsylvania State College. Bureau of Business Research. Bulletin of the Pennsylvania State College Bureau of Business Research. The Bureau, 1949.
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