edited by Di Lewis
Queensland University of Technology, 1999
Buku Teks
Aitchison, James, author
Cassell, 1994
Buku Teks
Sklare, Arnold B., author
McGraw-Hill, 1964
Buku Teks
Waldo, Willis H., author
Van Nostrand Reinhold, 1960
Koleksi Publik
Rougier, Harry, author
W.W. Norton, 1970
Buku Teks