Tireman, L.S.
The University , Iowa City, 1930
Buku Klasik
Uta Frith edited
Academic Press, 1980
Buku Teks
Lewis, Norman, author
Harper & Row , 1962
Buku Referensi
Geddes & Grosset, 2003
Buku Referensi
Bolander, Donald O., author
Lexicon Publication, 1993
Buku Referensi