Pornpimon Phongsuwan. 1996. A study of English language-based problems at Thai students of Washington State University. Department of Educational Leadership and Conuseling Psychology, Washingtion State University;

Pornpimon Phongsuwan. A study of English language-based problems at Thai students of Washington State University. . Washington:Washingtion State University, 1996.

Pornpimon Phongsuwan. (1996) A study of English language-based problems at Thai students of Washington State University . Washingtion State University/Washington.