Cram, Carol M.
Cengage Learning , 2012
Buku Teks SO
Hinkle, Deborah A.
MCGraw-Hill , 2002
Multimedia
Grauer, Robert T.
Pearson Education, 2003
Buku Teks SO
HInkle, Deborah
Glencoe/McGraw-Hill , 2002
Buku Teks SO
Elex Media Komputindo, 1999
Buku Teks SO