Wares, Alan C.
Santa Ana, 1968
Buku Teks
The Summer Institute of Linguistics bekerjasama dengan Departemen Pendidikan dan Kebudayaan, 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
edited by John Lyons
Penguin Books, 1973
Buku Teks