Vidya Mara
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1981
UI - Skripsi Membership
Bladon, Rachel
Passport Books, [Date of publication not identified]
Buku Teks SO
Wilkes, Angela
Passport Books, 1987
Buku Teks SO
Skaife, Linda
National Textbook Company, 1994
Buku Teks SO
Honnor, Sylvia
Arnold-Wheaton, 1986
Buku Teks SO