University of Foreign Studies, [date of publication not identified]
Buku Teks
Arends, Richard I., 1990-
McGraw-Hill, 2012
Buku Teks
Dewi Tristantini Budi
Fakultas Teknik Universitas Indonesia, 2000
UI - Laporan Penelitian
DePorter, Bobbi
Kaifa, 2001
Buku Teks
Zainal Asril
Rajawali, 2012
Buku Teks