Cooper, D. R. (1997). Metode Penelitian Bisnis Jilid 1 Donald R. Cooper, C. William Emory. Erlangga.
Lua i Stíl Chicago (17ú heag.)Cooper, Donald R. Metode Penelitian Bisnis Jilid 1 Donald R. Cooper, C. William Emory. Erlangga, 1997.
Lua MLA (8ú heag.)Cooper, Donald R. Metode Penelitian Bisnis Jilid 1 Donald R. Cooper, C. William Emory. Erlangga, 1997.
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