Cullen, S. S. (1961). Reducing production costs in the small business. Rydge's Business Journal.
Lua i Stíl Chicago (17ú heag.)Cullen, Samuel S. Reducing Production Costs in the Small Business. Sydney: Rydge's Business Journal, 1961.
Lua MLA (9ú heag.)Cullen, Samuel S. Reducing Production Costs in the Small Business. Rydge's Business Journal, 1961.
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