Spear, Percival, author
The University of Michigan Press, 1961
Buku Teks
Schmook, Ger
Helios, 1968
Buku Teks
Zikken, Aya, author
Nijgh & Van Ditmar, 1991
Buku Teks
Lloyd, G.E.R.
Cambridge University Press , 1991
Buku Teks
Hobbs, Lisa
McGraw-Hill, 1967
Buku Teks