Gaya APA
Cooper, Donald R.. (2008).
Business research methods .
Singapore:
McGraw hill.
Gaya Chicago
Cooper, Donald R..
Business research methods.
Singapore:
McGraw hill,
2008.
Text.
Gaya MLA
Cooper, Donald R..
Business research methods.
Singapore:
McGraw hill,
2008.
Text.
Gaya Turabian
Cooper, Donald R..
Business research methods.
Singapore:
McGraw hill,
2008.
Print.