Eicher C and Staatz J(1998)
title: International Agricultural Development.
The Johns Hopkins University Press, Baltimore and London

电子链接：无。下面有电子书的部分页面，但是想要电子版的全书。哪位高人帮帮忙吧，谢了先
http://books.google.com/books?hl=zh-CN&lr=&id=0OHsragTfYkC&oi=fnd&pg=PA155&dq=thunen+agriculture+intensification&ots=TQNbtMfJWZ&sig=y2_NGo0AKhc5xHiprD-LQf4wYkI