Withers, Bill, author
American Management Association, 2003
eBooks
Clardy, Alan, author
American Management Association, 2012
eBooks
Retno Setyawati, author
Fakultas Ilmu Keperawatan Universitas Indonesia, 2008
UI - Tesis (Open)
Itten
Buku Teks
Birren, Faber, author
Van Nostrand Reinhold, 1978
Buku Teks