Panitda Reanjaroensuk. 1999. An investigation into the English vocabulary proficiency in a natural science context of first year arts and science oriented university students. Faculty of Graduate Studies, Mahidol University;

Panitda Reanjaroensuk. An investigation into the English vocabulary proficiency in a natural science context of first year arts and science oriented university students. . Bangkok:Mahidol University, 1999.

Panitda Reanjaroensuk. (1999) An investigation into the English vocabulary proficiency in a natural science context of first year arts and science oriented university students . Mahidol University/Bangkok.