Ledefoged, Peter
Univeersity of Chicago Press, 1971
Buku Teks SO
Pike, Kenneth L. (Kenneth Lee), 1912-2000, author
Summer institute of linguistics, 1946
Buku Teks SO
Pullum, Geoffrey K., author
University of Chicago Press, 1986
Buku Teks
Ogden, Richard, author
Edinburgh University Press, 2017
Buku Teks SO
Heffner, R.M.S., author
University of Wisconsin Press, 1960
Buku Teks