Murdie, Alan, author
Earthscan, 1993
Buku Teks
Murdie, Alan, author
Earthscan, 1993
Buku Teks
Sax, Joseph L.
Alfred A.Knopf, 1971
Buku Teks
Rubinstein, Ronald, author
Pelican Books, 1947
Buku Teks
Kubasek, Nancy K., author
Pearson - Prentice Hall, 2005
Buku Teks