Morelos และผู้แต่งคนอื่นๆ. 1988. The equivalence of Thai topicalization to the English passive and the difficulties of the college of education of the Sri Nakarintrawirot University in learning English passive construction. , University of San Carlos;

Morelos และผู้แต่งคนอื่นๆ. The equivalence of Thai topicalization to the English passive and the difficulties of the college of education of the Sri Nakarintrawirot University in learning English passive construction. . Cebu:University of San Carlos, 1988.

Morelos และผู้แต่งคนอื่นๆ. (1988) The equivalence of Thai topicalization to the English passive and the difficulties of the college of education of the Sri Nakarintrawirot University in learning English passive construction . University of San Carlos/Cebu.