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Bittel, Lester Robert. (1978). Encyclopedia Of Professional Management II . Danbury: Grolier International.

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Bittel, Lester Robert. Encyclopedia Of Professional Management II. Danbury: Grolier International, 1978. Text.

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Bittel, Lester Robert. Encyclopedia Of Professional Management II. Danbury: Grolier International, 1978. Text.

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Bittel, Lester Robert. Encyclopedia Of Professional Management II. Danbury: Grolier International, 1978. Print.