Spelling it out...
Buku Teks
Furness, Edna L.
Spelling for the millions
Appleton Century , 1964
Buku Teks SO
Pratley, Rhiannedd
Spelling it out
London BBC Books 1988
Buku Teks
Bolander, Donald O.
The new Webster's spelling dictionary
Lexicon Publication, 1993
Buku Referensi
Collins English spelling dictionary
HarperCollins Publishers, 1993
Buku Referensi