Radlauer, Ruth
Bowmar, 1971
Buku Teks
International Reading Association / editor by Robert Schreiner, 1979
Buku Teks SO
Baker, Colin
Multilingual Matters Ltd., 1995
Buku Referensi
Longmans, 1966/1967
Buku Teks
Baker, Colin
Multilingual Matters, 1995
Buku Teks SO