Etzel, Michael J.
McGraw-Hill, 2004
Buku Teks SO
Kurtz, David L.
The Dryden Press , 1981
Buku Teks SO
Phillips, Charles F.
Boston , Houghton Mifflin
Buku Teks SO
Alex Soemadji Nitisemito
Ghalia Indonesia, 1984
Buku Teks
Alex Soemadji Nitisemito
Ghalia Indonesia, 1984
Buku Teks