Mortman, Doris
True colors
IXY Books, 1996
 Buku Teks
Tarcisius Soemarman, atuhor
True colors of citizenship behaviour: promoting metacognitive experientaial learning as an effective implementation for developing culture of tolerance which support an healthy-quality of sustainable environment / Tarcisius Soemarman
The Ary Suta Center, 2019
 Artikel Jurnal
Lessing, Doris
In pursuit of the English / Doris Lessing
Simon and Schuster, 1961
 Buku Teks SO
Da, Chen
Colors of the mountain/Da Chen
Random House, 1999
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Thakor, Anjan V.
The four colors of business growth
Academic Press, 2011
 Buku Teks SO