Suarr, Richard W.
Brown and Benchmark, 1996
Buku Teks
Allen, Harry E.
Macmillan Publishing Company, 1989
Buku Teks
Suarr, Richard W.
Brown and Benchmark, 1996
Buku Teks
Thatcher, G.W.
Frederick Ungar, [Date of publication not identified]
Buku Teks
Kapliwatzky, Jochanan
Rubin Mass, 1954
Buku Referensi