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Humphries, John. (2005). Grolier Business Library : managing through people . Hongkong: Grolier International.

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Humphries, John. Grolier Business Library : managing through people. Hongkong: Grolier International, 2005. Text.

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Humphries, John. Grolier Business Library : managing through people. Hongkong: Grolier International, 2005. Text.

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Humphries, John. Grolier Business Library : managing through people. Hongkong: Grolier International, 2005. Print.