Gross, Martin
Quintessence Publishing, 2015
Buku Teks
Thomson, Hamish
Wright , 1990
Buku Teks
Nahavandi, Afsaneh
Pearson/Prentice Hall, 2009
Buku Teks
Riehl-Sisca, Joan
Appleton-Century-Crofts, 1985
Buku Teks
Skeet, Muriel
Churchill Livingstone , 1980
Buku Teks