Georgetown University Press, 1972
Buku Teks SO
Greenberg, Joseph H. (Joseph Harold), 1915-2001
University of Chicago Press, 1957
Buku Teks SO
edited by Archibald A. Hill
Basic Books, 1969
Buku Teks SO
edited by Eric P. Hamp, Fred W. Householder, Robert Austerlitz
University of Chicago Press, 1966
Buku Referensi
Corder, Stephen Pit
Penguin Books , 1973
Buku Teks SO