Bowman, C. E., Percy, A. L., & Nichols, F. G. (1941). Business and bookkeeping procedure. American book company.
Lua i Stíl Chicago (17ú heag.)Bowman, Charles E., Atlee L. Percy, agus Frederick George Nichols. Business and Bookkeeping Procedure. New York, Cincinnati [etc.]: American book company, 1941.
Lua MLA (8ú heag.)Bowman, Charles E., et al. Business and Bookkeeping Procedure. American book company, 1941.
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