Drews, Jurgen, editor
Roches, 1990
Buku Teks
Drews, Jürgen
Springer-Verlag, 1990.
Buku Teks
Burrows, William E.
W.B. Saunders, 1959
Buku Teks
Rampal, K.K.
Oxford & IBH, 1982
Buku Teks
edited by Jeffery Parker, William A. Haswell
Macmillan, 1962
Buku Teks