Daniel, Wayne W.
Houghton Miffiln, 1989
Buku Teks SO
Shao, Stephen P.
Charles E. Merrill, 1976
Buku Teks SO
Freund, John E.
Prentice-Hall, 1980
Buku Teks SO
Allen, R.G.D.
Hutchinson University Library, 1972
Buku Teks SO
Carlborg, Frank W.
Scoott, Foresman, 1968
Buku Teks SO