Krone, robert M.
John Wiley & Sons, 1980
Buku Teks
edited by Grace J. Kelleher
John Wiley & Sons, 1970
Buku Teks
Weimer, David L., author
Prentice-Hall, 1992
Buku Teks
Weimer, David L., author
Pearson Prentice Hall, 1989
Buku Teks
Weimer, David L., author
Routledge, 2014
Buku Teks