Torre, Jose de la, author
McGraw-Hill , 2001
Buku Teks
Yip, George S., author
Prentice-Hall, 1995
Buku Teks
Yip, George S., author
Prentice-Hall, 1992
Buku Teks
Yip, George S., author
Prentice-Hall, 1995
Buku Teks
Carlson, Beverley A., author
UNICEF, 1990
Buku Teks