edited by Norman MacKenzie
The New American Library, 1968
Buku Teks
Mouton, Jane S.
Hague, 1968
Buku Teks
United Nations Educational, Scientific and Cultural Organization (UNESCO)
UNESCO, 1984
Buku Teks
Standford University Press, 1996
Buku Teks
Pratt Vernon
Methuen Press, 1978
Buku Teks