Villacarlos, L. C. (2009). Happily spending old age in farming. Agriculture.
芝加哥风格引文Villacarlos, Leon C. "Happily Spending Old Age in Farming." Agriculture 2009.
MLA引文Villacarlos, Leon C. "Happily Spending Old Age in Farming." Agriculture, 2009.
警告：这些引文格式不一定是100％准确.