<?xml version="1.0" encoding="UTF-8"?>
<xml><bibliography><APA>Prapai Chairoj. (1995) Nitrogen Status of Upland Soils. &lt;i&gt;Thai Agricultural Research Journal&lt;/i&gt;, &lt;i&gt;13&lt;/i&gt;(1), 43-52.</APA><Chicago>Prapai Chairoj. "Nitrogen Status of Upland Soils". Thai Agricultural Research Journal  13 (1995):43-52.</Chicago><MLA>Prapai Chairoj. Nitrogen Status of Upland Soils. Department of Agriculture:ม.ป.ท. 1995.</MLA></bibliography></xml>
