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Doreen Virtue, Ph.D.. (2001). Indigo Challenge . JAKARTA: PT Bhuana Ilmu Populer.

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Doreen Virtue, Ph.D.. Indigo Challenge. JAKARTA: PT Bhuana Ilmu Populer, 2001. Text.

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Doreen Virtue, Ph.D.. Indigo Challenge. JAKARTA: PT Bhuana Ilmu Populer, 2001. Text.

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Doreen Virtue, Ph.D.. Indigo Challenge. JAKARTA: PT Bhuana Ilmu Populer, 2001. Print.