edited by David Partington
Sage, 2002
Buku Teks
Glazier, Jack D.
Libraries Unlimited, 1992
Buku Teks
Locke, Karen
Sage, 2001
Buku Teks
Chorafas, Dimitris N.
Reinhold Publishing Corporation, 1958
Buku Teks
edited by Joseph F. McCloskey, Florence N. Trefethen
John Hopkins Press, 1954
Buku Teks