Mohammad Rokiba, author
1995
UI - Skripsi (Membership)
Willems, Leonard
s-Gravenhage Martinus Nijhoff 1934
Buku Teks
Woolley, Leonard
Penguin Books , 1953
Buku Teks
M. Iqbal Amran, author
1989
UI - Skripsi (Membership)
Binder, Leonard
University of California Press, 1961
Buku Teks