Chaiyaphorn Pongsak. 1999. Problems in needs of police cadet on investigation training in Metropolitan Police Station. Faculty of Graduate Studies, Mahidol University;
Chaiyaphorn Pongsak. (1999) Problems in needs of police cadet on investigation training in Metropolitan Police Station . Mahidol University/Bangkok.
Chaiyaphorn Pongsak. Problems in needs of police cadet on investigation training in Metropolitan Police Station. . Bangkok:Mahidol University, 1999.
Chaiyaphorn Pongsak. (1999) Problems in needs of police cadet on investigation training in Metropolitan Police Station . Mahidol University/Bangkok.