บรรณานุกรม

A Balanced Diet”  Retrieved from www.purchon.com/biology/diet.htm on September 15, 2010.
“Auxiliary Verbs”   Retrieved from http://www.ego4u.com/en/cram-up/grammar/auxiliary-verbs
        on August 12, 2010.
 “Beaches and Islands”  Retrieved from
        http://www.tourismthailand.org/about-thailand/nature/beaches-and-islands
        on September 15, 2010.
 Biber, D, Conrad, S and Leech, G.  (2002). Longman Grammar: Spoken and Written English
        Pearson Education Inc.
“Cloud”  Retrieved from en.wikipedia.org/wiki/Cloud on  August 15, 2010.
“English Grammar Exercises”  Retrieved from http://englishonline.sites.uol.com.br/english/basic.htm
        on September 5, 2010.
“How to Discuss” Retrieved from
        http://www.bbc.co.uk/worldservice/learningenglish/radio/specials/1756_how_to_discuss/page5.shtml
        on  February 2, 2011.
“How You Should Dress For A Job Interview”  Retrieved from
        http://www.exforsys.com/career- center/job-search-tips/how-you-should-dress-for-a-job- 
        interview.html
  on September 15, 2010.
“Ipod”  Retrieved from en.wikipedia.org/wiki/IPod on  July 9, 2010.
Murphy, R.  (1985)  English Grammar in Use.  Cambridge: Cambridge University Press.
“Our World 2.0”  Retrieved from
        http://ourworld.unu.edu/en/climate-change-adaptation-for-thailands-rice-farmers/
        on  September 15, 2010.

“Subject-Verb Agreements”  Retrieved from

        http://downloads.bbc.co.uk/worldservice/learningenglish/grammarchallenge/pdfs/gc_47_
        subject_verb_quizzes.pdf
on February 2, 2011.

“Swine Flu”  Retrieved from www.bbc.co.uk/1/hi/8021958.shtml on  September 15, 2010.
“Ten Effective Ways to Reduce Global Warming”  Retrieved from

        http://ezinearticles.com/?Ten-Effective-Ways-to-Reduce-Global-Warming&id=4029295

        on February 1, 2011.