Situmorang, Hamzan
Program Pascasarjana Universitas Indonesia, 1993
UI - Tesis (Membership)
Calmette, Joseph
Presses Universitaires de France, 1951
Buku Teks
Stephenson, Carl
Great Seal Books, 1956
Buku Teks
L. Ibrahim
Usaha Penerbitan MArhaen, 1959.
Buku Teks
R. Mohamad Ali
Ganaco, 1963
Buku Teks