Theophanous, Andrew C.
Oxford University Press, 1980
Buku Teks
Herz, John H.
David McKay, 1976
Buku Teks
Pethybridge, Roger
Frederick A. Praeger, 1962
Buku Teks
Thompson, Kenneth W., author
Princeton University Press, 1960
Buku Teks
Macmillan, 1990
Buku Teks