Rose, Peter S., author
Business Publications, 1980
Buku Teks
Majid, Hawa Abdul
Perpustakaan Negara Malaysia, 1996
Buku Referensi
Harsja W. Bachtiar, 1934-, author
Indonesian Institute of Sciences, 1976
Buku Referensi
New Marketing Limited, 1994
Buku Teks
KAT International Marketing Service, 1972
Buku Referensi