Eades, Mary Dan
Dell Publishing, 2000
Buku Teks SO
Eades, Mary Dan
Dell Publishing, 2000
Buku Teks SO
Griffith, H. Winter
Fisher Books, 1998
Buku Teks SO
Black Dog & Leventhal Publisher, Inc, 2004
Buku Teks SO
Groff, James R.
Osborne/Mcgarw-Hill, 1999
Buku Referensi