Covey, Stephen R., author
Gramedia, 2005
Buku Teks
Covey, Stephen R., author
Free Press, 2005
Multimedia
Clear, James, author
Gramedia Pusaka Utama, 2022
Buku Teks
Arden, Paul, author
Phaidon, 2003
Buku Teks
Schwartz, David Joseph, author
Binarupa Aksara, 1992
Buku Teks