Bradley, Teresa, author
West Sussex Wiley, 2013
Buku Teks
Armstrong, James W., author
Macmillan, 1976
Buku Teks
Campbell, Hugh G., author
Macmillan, 1974
Buku Teks
Rothenberg, Ronald I., author
John Wiley & Sons, 1980
Buku Teks
Drooyan, Irving, author
Wadsworth, 1971
Buku Teks