Phontip Kanlahasuth. 2008. Improvement of cummunication efficiency in half mask users. Field of Study Industrial Hygiene and Science, Mahidol University;
Phontip Kanlahasuth. (2008) Improvement of cummunication efficiency in half mask users . Mahidol University/Bangkok.
Phontip Kanlahasuth. Improvement of cummunication efficiency in half mask users. . Bangkok:Mahidol University, 2008.
Phontip Kanlahasuth. (2008) Improvement of cummunication efficiency in half mask users . Mahidol University/Bangkok.