Moeran, Brian
Surrey Curzon , 1996
Buku Teks
Duffy, Ben
Prentice-Hall, 1957
Buku Teks
Bogart, Leo, author
NTC Businnes Book, 1990
Buku Teks
Pertierra, Anna Cristina, author
Polity Press, 2018
Buku Teks
Sissors, Jack Z
NTC Businness Books, 1993
Buku Teks