Vickers, Brian
at the University Press, 1968
Buku Teks
Frost, Walter
Munchen Verlag Ernst Reinhardt 1926
Buku Teks
Blaisdell, 1969
Buku Teks
Brodrick, S.J. James, author
Wicklow Press, 1952
Buku Teks
Bacon, Wallace A.
Holt, Rinehart and Winston, Inc., 1972
Buku Teks