Vidya Mara
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1981
UI - Skripsi Membership
Simanjuntak, Herpinus
Kesaint Blanc, 2013
Multimedia
Graham, Gaelle
Kesaint Blanc, 2011
Buku Teks SO
Bladon, Rachel
Passport Books, [Date of publication not identified]
Buku Teks SO
Wilkes, Angela
Passport Books, 1987
Buku Teks SO