Phrik ran 39 (2532 (1989)), 4-6 m, chemical development studies, 56 pages, Publisher, Bangkok-86
Ministry of education, textbook of chemistry journals, 2 additional definitions of Sok sok. LAT phrao
24-58
nun online accessed from] http:/th.wikipidia.Org/wiki/nun (September 4, 2013)
paper making [on-line accessed from]
http: www.paperlandonline.com/knowledge.php?ID=7 (September 15, 2013)
oil [Online accessed from] http://student.nu. ac.th scince nature/oil (September 17, 2013)
.
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