Nicholson, Margaret
Oxford University Press, 1957
Buku Referensi
Black, Henry Campbell
West Publishing, 1990
Buku Referensi
Black, Henry Campbell
West Publishing, 1990
Buku Teks
Black, Henry Campbell
West Publishing, 1985
Buku Referensi
McCarthy, Eugene J., 1916-2005
Macmillan, 1962
Buku Teks