Isaacs, Harold R., author
Atheneum, 1968
Buku Teks
Goodman, David S. G., author
Routledge, 1994
Buku Teks
Gasster, Michael
University of Washington, 1969
Buku Teks
Meisner, Maurice
Atheneum, 1982
Buku Teks
Duranti, Marco, author
Oxford University Press, 2017
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