Raven Press, 1985
Buku Teks
UNU , 1983
Buku Teks
Patton, Kistner, author
Little, Brown and Company, 1984
Buku Referensi
Meri Oktaria, author
Universitas Indonesia, 2012
UI - Skripsi (Open)
Joshi, Shubhangini A., author
Tata McGraw-Hill, 1992
Buku Teks