Hancaster, Geoff
Crest Publishing House, 2002
Buku Teks
Keegan, Warren J., author
Prentice-Hall, 1980
Buku Teks
Markin, Rom J., author
John Wiley & Sons, 1982
Buku Teks
edited by David B. Montgomery and Glen L. Urban
Prentice-Hall, 1970
Buku Teks
edited by David B. Montgomery and Glen L. Urban
Prentice-Hall, 1970
Buku Teks