Dewitz, Sandra Donaldson, author
McGraw-Hill, 1996
Buku Teks
Kendall, Penny A., author
Irwin , 1996
Buku Teks
Boyd & Fraser , 1991
Buku Teks
Rowley, E. Jennifer, author
Clive bingley, 1990
Buku Teks
Chester, Myrvin, author
McGraw-Hill, 2002
Buku Teks