Forceville, Charles
Routledge, 1996
Buku Teks
Reichert, Gene
Alexander Hamilton Institute, 1972
Buku Teks
Moriarty, Sandra E. (Sandra Ernst), author
Prentice Hall International, 1991
Buku Teks
St John, Maggie Jo
Prentice Hall ELT, 1994
Buku Teks
Berita Buana, 1977
Buku Teks