edited by Thomas A. Sebeok
Mouton, 1968
Buku Referensi
Boles, John B.
Blackwell Publishers, 2002
Buku Teks
Sage, 1987
Buku Teks SO
Key, Mary Ritchie
Tubingen Gunter Narr Verlag 1979
Buku Teks
Washington United States Government Printing Office 1948
Buku Teks