Shaw, Josephine, author
Macmillan, 1993
Buku Teks
Groves, Peter J., author
Cavendish, 1995
Buku Teks
by George A. Bermann ... [et al.]
West Pub. Co., 1993
Buku Teks
Lasok, Dominik, author
Butterworth, 1991
Buku Teks
Toth, A. G., author
Clarendon Press, 1990
Buku Referensi