Gleason, Henry Allan
Holt, Rinehard, 1963
Buku Teks
Lehmann, Winfred P., author
Random House, 1976
Buku Teks
Demers, Richard A.
MIT Press, 1991
Buku Teks
edited by Anne E. Baker and Kees Hengeveld
Wiley-Blackweell, 2012
Buku Teks
edited by Archibald A. Hill
Voice of America, 1969
Buku Teks