Lehmann, Donald R., author
Market research and analysis
Topan, 1989
 Buku Teks
Lehmann, Donald R., author
Market research and analysis
Richard D. Irwin, 1989
 Buku Teks
Lehmann, Donald R., author
Market research and analysis
Richard D. Irwin, 1979
 Buku Teks
Market research in health and social care
Mike Luck, Rob Pocock, Mike Tricker, editor
Routledge, 2000
 Buku Teks
Artificial market study as interdiciplinary research
 Artikel Jurnal
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