St. Martin's press, 1981
Buku Teks SO
edited by Sol Saporta
Holt, Rinehart and Winston, 1961
Buku Teks
edited by Eric P. Hamp, Fred W. Householder, Robert Austerlitz
University of Chicago Press, 1966
Buku Referensi
Muller, F Max
Verlag von Julius Klinkhardt, 1875
Buku Teks
edited by Martin Joos
University of Chicago Press, 1966
Buku Referensi