Weinberg, Steve, author
ST. Martin's Press, 1995
Buku Referensi
Bonehill, Jane, author
BlackWell Publishing, 2007
Buku Referensi
Weinberg, Steve, author
ST. Martin's Press, 1996
Buku Teks
Bassett, Kathy B., author
Pearson, 2015
Buku Teks
Singh, Karanprakash, author
Lambert Academic Publishing , 2011
Buku Teks