Henderson, Carter F., author
Holt, Rinehart and Winston, 1985
Buku Teks
Aulet, Bill, 1958-, author
John Wiley & Sons, 2013
Buku Teks
Berkowski, George, author
Piatkus, 2014
Buku Teks
Kay, Frances, author
Institute of South East Asia Studies, 2009
eBooks
Ries, Eric, 1978, author
Penguin Random House, 2011
Buku Teks