Kubba, Sam
Buth-Helnemn, 2012
Buku Teks
Gang Da Press, 2011
Buku Referensi
Yudelson, Jerry
McGraw-Hill, 2009
Buku Teks
Hall, Fred
Butterworth-Heinemann, 2003
Buku Teks
edited by Richard N. White, Charles G. Salmon
John Wiley & Sons, 1987
Buku Referensi