วิจัยเรื่องนี้ใช้ส่วนของวรรณกรรมที่

This part of the research subject, the relevant literature used as key elements to help with research, development, and are more reliable. On the part of the history of literature, we use all that has made education. Expected results we use of ethnographical Ben became a master in writing.And part of the query that we borrowed the Bo's used.

This research is part of the relevant literature as a critical component to the research, development and credibility even more
in terms of a use literature to all of the study's
results are expected. we used to get Ben out of the literary masters of writing
and the use of questionnaires. We borrowed the boat used

This research used parts of the related literature was used as the key element to help the development and reliability more and more.In the background we use literature about was investigated.The expected results, we used the literature of Ben as a model in writing.And parts of the questionnaire. We borrow Boehm used.