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
Kapliwatzky, Jochanan
Rubin Mass, 1954
Buku Referensi
Thatcher, G.W.
Frederick Ungar, [Date of publication not identified]
Buku Teks