Sukadji Ranuwihardjo, author
Departemen Pendidikan dan Kebudayaan, 1990
Buku Teks
Langan, John, 1942-, author
McGraw-Hill, 1992
Buku Teks
August, Diane
Center for Applied Linguistics, 2006
Multimedia
Apps, Jerold W., author
Jossey-Bass , 1985
Buku Teks
editor, Jerry Mintz
Macmillan, 1994
Buku Referensi