Greenberg, Joseph H. (Joseph Harold), 1915-2001
University of Chicago Press, 1957
Buku Teks SO
edited by Eric P. Hamp, Fred W. Householder, Robert Austerlitz
University of Chicago Press, 1966
Buku Referensi
Corder, Stephen Pit, editor
Penguin Books , 1973
Buku Teks SO
Hall, Robert A.
Anchor Books, 1960
Buku Teks SO
Harris, Zellig S.
D. Reidel , 1970
Buku Teks SO