Levin, Richard B., author
Osborne McGraw-Hill, 1990
Buku Referensi
editor-in-chief C.H. Chen
McGraw-Hill, 1992
Buku Referensi
Dewdney, A.K., author
W.H. Freeman, 1990
Buku Teks
Jackson, Barbara Burn, author
Richard D. Irwin Inc, 1979
Buku Teks
Stalling, William, author
Indiana: SAMS, 1990,
Buku Referensi