Furness, Edna L.
Spelling for the millions
Appleton Century , 1964
 Buku Teks SO
Basch, Lester D.
Spelling self-taught: a teaching-machine book
Sterling Publishing, 1962
 Buku Teks SO
Collins English spelling dictionary
HarperCollins Publishers, 1993
 Buku Referensi
Yates, Paulene M.
Workbook and handbook : the new building better english / Paulene M. Yates, Edward N. de Laney
Harper & Row, 1962
 Buku Teks SO
Mudd, Norma
Effective spelling : a practical guide for teachers / Norma Mudd
Hodder & Stoughton Educational , 1998
 Buku Teks