New, Christopher, author
Routledge, 1999
Buku Teks
Cahn, Steven M., author
Harper & Row, 1971
Buku Teks
Armstrong, A.H., author
Newman Press, 1949
Buku Teks
Tidman, Paul, author
Wadsworth, 1999
Buku Teks
Hausman, Alan, author
Wadsworth and Cengage Learning, 2013
Buku Teks