Stevick, Earl W.
Abingdon, 1967
Buku Teks
Parrot, Martin, author
Cambridge University Press, 2003
Buku Teks
Croft, Kenneth
Mass. Winthrop , 1972
Buku Teks
Hillier, Walter Caine, Sir, 1849-1927, author
Kegan Paul, 1945
Buku Teks
Thornburn, Scott, 1950-, author
Cambridge University Press, 2017
Buku Teks