Cunningham, George K., author
Falmer Press, 2008
Buku Teks
Bittel, Lester Robert, author
Alexander Hamilton Institute, 1986
Buku Teks
Cohen, Ronald Jay, author
McGraw-Hill, 2005
Buku Teks
Cohen, Ronald Jay, author
McGraw-Hill, 2005
Buku Teks
Cohen, Ronald Jay, author
McGraw-Hill, 2009
Buku Teks