American Speech : A quarterly of Linguistic Usage
Columbia : Columbia University Press and American Dialect Society
 Majalah, Jurnal, Buletin
Levy, Leonard W.
Freedom of speech and press in early American history
Harper, 1963
 Buku Teks SO
Ladefoged, Peter
Vowels and consonant : an introduction to the sounds of languages
Blackwell, 2001
 Buku Teks SO
Buckley, Lillian A.
Picnic of sounds : a playful approach to reading
Citation Press, 1975
 Buku Teks
Traditional music : sounds in harmony with nature
Seoul Selection, 2011
 Buku Teks SO