BITTEL, L. R. Encyclpedia Of Professional Management Lester Bittel. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBITTEL, Lester R. Encyclpedia Of Professional Management Lester Bittel. McGraw-Hill.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBITTEL, Lester R. Encyclpedia Of Professional Management Lester Bittel. McGraw-Hill.
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