Cashman, Thomas J.
Anaheim Publishing, 1970
Buku Teks
Spencer, Donald D.
Charles E. Merrill, 1982
Buku Teks SO
Fariz Darari
Fakultas Ilmu Komputer Universitas Indonesia, 2012
Artikel Jurnal
Awad, Elias M.
Prentice-Hall, 1966
Buku Teks SO
edited by I.H. Gould
North-Holland , 1971
Buku Teks SO