Springer, 2017
Buku Teks
Usry, Milton F., author
South Western, 1988
Buku Teks
Schroeder, Richard G., author
John Wiley & Sons, 1978
Buku Teks
Hatcher, Robert A., author
Population Information Program, 2001
Buku Teks
Emerson, Brian, 1967- , author
American Management Association, 2008
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