Mccoy, Alfred W.
Harper and Row, 1972
Buku Teks
Apipudin
Akbar Media Sarana, 2008
Buku Teks SO
Lubis, Mochtar, 1922-2004
Gapura, 1951
Buku Teks SO
Schregle, Johannes
UP.Law Center, 1975
Buku Teks
Jafar suryomenggolo, editor
Marjin Kiri, 2021
Buku Teks SO