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Training, Dale Carnegie. (2019). The 5 Essential People Skills . Jakarta: PT Gramedia Pustaka Utama.

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Training, Dale Carnegie. The 5 Essential People Skills. Jakarta: PT Gramedia Pustaka Utama, 2019. Text.

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Training, Dale Carnegie. The 5 Essential People Skills. Jakarta: PT Gramedia Pustaka Utama, 2019. Text.

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Training, Dale Carnegie. The 5 Essential People Skills. Jakarta: PT Gramedia Pustaka Utama, 2019. Print.