Rudi Priatama Singgih, author
1986
UI - Skripsi (Membership)
R. Andre Maulana, author
1997
UI - Skripsi (Membership)
Nichols, Herbert L., author
McGraw-Hill, 2010
Buku Teks
Wauchope, Robert
The University of Chicago Press, 1965
Buku Teks
Church, Horace K., author
McGraw-Hill, 1981
Buku Referensi