Cullen, S. S. (1961). Reducing production costs in the small business. Rydge's Business Journal.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCullen, Samuel S. Reducing Production Costs in the Small Business. Sydney: Rydge's Business Journal, 1961.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCullen, Samuel S. Reducing Production Costs in the Small Business. Rydge's Business Journal, 1961.
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