Iwan Gunawan, Lena Sumargana, Nani Hendiarti, Guy Adamsyah
Directorate of technology for natural resources development, 1995
Buku Referensi
Bettinger, Pete, author
McGraw-Hill, 2004
Buku Teks
Bettinger, Pete, author
Higher Education, 2004
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Kennedy, Michael, author
John Wiley & Sons, 2013
Buku Teks
Kochtanek, Thomas R., author
Libraries Unlimited , 2002
Buku Teks