Douglas, Edna
Economics of marketing / EdnaDouglas
Harper & Row , 1975
 Buku Teks
Stone, Merlin
Marketing and economics / Merlin Stones
Macmillan, 1980
 Buku Teks SO
Cooperative and commune
The University of Winconsin Press, 1977
 Buku Teks SO
Cooperative and commune
The University of Winconsin Press, 1977
 Buku Teks SO
Samuelson, Paul Anthony, 1915-2009
Economics
McGraw-Hill, 2010
 Buku Teks SO