edited by Eric P. Hamp
Mouton, 1973
Buku Teks
Hughes, John P., author
Random House, 1966
Buku Teks
Lehmann, Winfred P., author
Random House, 1976
Buku Teks
Gleason, Henry Allan
Holt, Rinehard, 1963
Buku Teks
Wartburg, Walther V.
Barnew and noble, 1969
Buku Teks