Tino Saroengallo, author
1986
UI - Skripsi (Membership)
Hutagaol, Savitra B., author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1982
UI - Skripsi (Membership)
Wu, Y.C.
Amsterdam Djambatan 1950
Buku Teks
Jansen, Marius B., author
Harvard University Press, 1967
Buku Teks
Martin, Bernard
William Heinemann, 1944
Buku Teks