Panjaitan, Petrus Irwan, 1958-
2004
UI - Disertasi (Membership)
Panjaitan, Petrus Irwan, 1958-
2004
UI - Disertasi (Membership)
Y.W. Sunindhia
Bina Aksara, 1988
Buku Teks
Ris`an Rusli
Rajawali, 2013
Buku Teks
Panjaitan, Petrus Irwan, 1958-
1992
UI - Tesis (Membership)