Welsch, Glenn A., author
Salemba Empat , 2000
Buku Teks
Welsch, Glenn A., author
Salemba Empat, 2000
Buku Teks
Siagian, Helson, author
1990
UI - Tesis (Membership)
Djoni Praptomo, author
Universitas Indonesia, 2009
UI - Tesis (Open)
Kustoro Budiarta, author
1998
UI - Tesis (Membership)