Nahavandi, Afsaneh, author
Pearson/Prentice Hall, 2009
Buku Teks
Riehl-Sisca, Joan
Appleton-Century-Crofts, 1985
Buku Teks
Skeet, Muriel, author
Churchill Livingstone , 1980
Buku Teks
Nahavandi, Afsaneh, author
Prentice-Hall, 2000
Buku Teks
Oxford University Press, 2005
Buku Teks