Geisst, Charles R., author
Macmillan, 1993
Buku Teks
Johnson, Hazel J., author
McGraw-Hill, 1993
Buku Teks
Scott, W. Richard
SAGE Publications, Inc, 2014
Buku Teks
edited by Joel Gehman, Michael Lounsbury, Royston Greenwood
Emerald, 2017
eBooks
Edmister, Robert O.
McGraw-Hill , 1986
Buku Teks