Charles Scribner's Sons, 1976
Buku Referensi
McCarthy, Eugene J.
Macmillan, 1962
Buku Teks
Makkai, Adam
Barrons, 1995
Buku Teks
Cummings, Paul, author
St. Martin's Press, 1966
Buku Referensi
Evans, Bergen, 1904-, author
Random House, 1957
Buku Referensi