Yudelson, Jerry, author
McGraw-Hill, 2009
Buku Teks
Merriam, Charles E. (Charles Edward), author
New York University Press, 1936
Buku Teks
Solomos, John, author
Routledge, 1995
Buku Teks
Sherman, Arnold K., author
Wadsworth, 1987
Buku Teks
Mackenzie,
Penguin Books, 1969
Buku Teks