Tireman, L.S.
Value of marking hard spots in spelling / by L.S. Tireman
The University , Iowa City, 1930
 Buku Klasik
Cognitive processes in spelling
Uta Frith edited
Academic Press, 1980
 Buku Teks
Lewis, Norman, author
Dictionary of correct spelling : a handy reference guide
Harper & Row , 1962
 Buku Referensi
Dictionary of spelling : get results!
Geddes & Grosset, 2003
 Buku Referensi
Bolander, Donald O., author
The new Webster's spelling dictionary
Lexicon Publication, 1993
 Buku Referensi
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