Roberts, Edward B.
The dynamics of research and development
Harper & Row, Pub., 1964
 Buku Teks
Cooper, Donald R., author
Business research methods
McGraw-Hill, 2001
 Buku Teks
Cooper, Donald R., author
Business research method
McGraw-Hill, 2008
 Buku Teks
Cooper, Donald R., author
Business research method
McGraw-Hill, 2008
 Buku Teks
Cooper, Donald R., author
Business research method
McGraw-Hill, 2008
 Buku Teks
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