<?xml version="1.0" encoding="UTF-8"?>
<xml><bibliography><APA>Pornsawan Duangsuwan. (1998) Circle of Willis. &lt;i&gt;Journal of Medicine and Health Sciences&lt;/i&gt;, &lt;i&gt;5&lt;/i&gt;(1), 32-37.</APA><Chicago>Pornsawan Duangsuwan. "Circle of Willis". Journal of Medicine and Health Sciences  5 (1998):32-37.</Chicago><MLA>Pornsawan Duangsuwan. Circle of Willis. Faculty of Medicine,Srinakharinwirot University:ม.ป.ท. 1998.</MLA></bibliography></xml>
