Ury, William, author
Bantam Books, 1992
Buku Teks
Ury, William, author
Hodder & Stoughton, 2007
Buku Teks
Harvard Business School Press, 2004
Buku Teks
Awaluddin Tjalla, author
Fakultas Psikologi Universitas Indonesia, 1998
UI - Disertasi (Membership)
oleh Fakultas Hukum Universitas Indonesia
FH UI, 1993
Buku Teks