Longmans, 1966/1967
Buku Teks
Parrot, Martin, author
Cambridge University Press, 2003
Buku Teks
Morris, Henry M., author
Creation-Science Research Center, 1971
Buku Referensi
International Reading Association / editor by Robert Schreiner, 1979
Buku Teks
Protherough, Robert
Open University Press, 1991
Buku Teks