Lubis, Akhyar Yusuf
Faculty of Humanities University of Indonesia, 2004
Artikel Jurnal
edited by John K. Ryan
The Catholic University of America Press, 1963
Buku Teks
Hari Purwanto
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2013
UI - Skripsi Membership
George allen & Unwin, ltd, 1948
Buku Teks
Gouch, J.W.
Clarendon Press, 1950
Buku Teks