Berri, D. J. (1997). Explorations in comparative advantage recycling. Colorado State University.
Chicago Style (17th ed.) CitationBerri, David J. Explorations in Comparative Advantage Recycling. Fort Collins, Colorado: Colorado State University, 1997.
MLA引文Berri, David J. Explorations in Comparative Advantage Recycling. Colorado State University, 1997.
警告：這些引文格式不一定是100％准確.