©2013 National Research Council of Thailand
Peerawit Wannawittayapa. 1999. Trusted electronic mail system on internet. Faculty of Graduate Studies, Mahidol University;
Peerawit Wannawittayapa. (1999) Trusted electronic mail system on internet . Mahidol University/Bangkok.
Peerawit Wannawittayapa. Trusted electronic mail system on internet. . Bangkok:Mahidol University, 1999.
Peerawit Wannawittayapa. (1999) Trusted electronic mail system on internet . Mahidol University/Bangkok.