Lofts, Brian
The English Language Book Society, 1970
Buku Teks
Allee, W.C., author
John Wiley & Sons, 1963
Buku Teks
Noble, Elmer R., author
Lea & Febiger, 1961
Buku Teks
Willingham, Daniel T., author
Pearson, 2014
Buku Teks
Orwell, George, 1903-1950, author
Penguin Books, 1955
Buku Teks