Hays, H.R.
Alfred A. Knofpf, 1958
Buku Teks
Kuper, Adam, author
Pica Press, 1973
Buku Teks
Clifford, James, 1945-, author
Harvard University Press, 1988
Buku Teks
Moberg, Mark, 1959-, author
Routledge, 2013
Buku Teks
McGee, R. Jon, author
McGraw-Hill, 2012
Buku Referensi