Harrison, Richard
Churchill Livingstone, 2011
Buku Teks
edited by Chloe Sellwood, Andy Wapling
MA CABI, 2016
Buku Teks
Mehta, Vivek
LAP LAMBERT Academic Publishing, 2014
Buku Teks
Mistovich, Joseph J.
Prentice-Hall, 2000
Buku Teks
FK UKI, 1999
Buku Teks