Universitas Indonesia, 1983
UI - Skripsi (Membership)
Covey, Stephen R., author
Bina Rupa Aksara, 1994
Buku Teks
Covey, Stephen R., author
Gramedia Asri Media, 1994
Buku Teks
Covey, Stephen R., author
Bina Rupa Aksara, 1997
Buku Teks
Gede Prama, author
Gramedia Pustaka Utama, 2006
Buku Teks