Iwan Gunawan, Lena Sumargana, Nani Hendiarti, Guy Adamsyah
Directorate of technology for natural resources development, 1995
Buku Referensi
penyunting, Aryo Hanggono, Syamsul B. Agus
BPP Teknologi, 1999
Buku Referensi
edited by Andrew Skidmore
Taylor and Francis, 2002
Buku Teks
Bettinger, Pete
McGraw-Hill, 2004
Buku Teks
Bettinger, Pete
Higher Education, 2004
Buku Teks