Gelles, Richard J., author
McGraw-Hill College , 1999
Buku Teks
Enos, Matthew, author
Wadsworth, 2002
Buku Teks
Mizrahi, Abe, author
John Wiley & Sons, 1979
Buku Teks
Barnett, Frederic, author
Wadsworth, 1967
Buku Teks
Barnett, Frederic, author
Wadsworth, 1968
Buku Teks