Ullrich. The Iowa State Fair. University of Iowa Press.
芝加哥风格引文Ullrich. The Iowa State Fair. University of Iowa Press.
MLA引文Ullrich. The Iowa State Fair. University of Iowa Press.
警告：这些引文格式不一定是100％准确.
APA引文
Ullrich. The Iowa State Fair. University of Iowa Press.
芝加哥风格引文Ullrich. The Iowa State Fair. University of Iowa Press.
MLA引文Ullrich. The Iowa State Fair. University of Iowa Press.