Lewis, Norman
Dictionary of correct spelling : a handy reference guide
Harper & Row , 1962
 Buku Referensi
Basch, Lester D.
Spelling self-taught: a teaching-machine book/by Lester D. Basch and Milton Finklestein
Sterling Publishing , 1962
 Buku Teks
Carney, Edward, translator
English spelling/ Edward Carney
Routledge,, 1997
 Buku Teks
Furness, Edna L.
Spelling for the millions
Appleton Century , 1964
 Buku Teks
Ur, Penny
Grammar practice activities : a practical guide for teachers
Cambridge University Press, 1988
 Buku Teks