Gaya APA
KONRAD, E., ERICKSON, R.
(1971).
Marketing research:
.
Bombay:
D.B Taraporevala Son & Co.
Gaya MLA
KONRAD, Evelyn., ERICKSON, Rod.
"Marketing research: ".
Bombay:
D.B Taraporevala Son & Co,
1971.
Buku.