MacEoin, Gary, author
P.J. Kenedy & Sons, 1963
Buku Teks
Conrad, Eric, author
Syngress, 2014
eBooks
Robbins, Stephen P., author
Pearson Education International, 2005
Buku Teks
Robbins, Stephen P., author
Pearson Prentice Hall, 2005
Buku Teks
Churchill, Winston, Sir, 1874-1965, author
Houghton Miffiln, 1949
Buku Teks