Oliver, A. W.; E. L. Potter. Fattening Pigs for Market(PDF). Agricultural Experiment Station Bulletin. November 1930, (269): 14 [21 November 2012]. (原始内容(PDF)存档于2013-11-05).引文使用过时参数coauthors (帮助)
Oliver, A. W.; E. L. Potter. Fattening Pigs for Market(PDF). Agricultural Experiment Station Bulletin. November 1930, (269): 14 [21 November 2012]. (原始内容(PDF)存档于2013-11-05).引文使用过时参数coauthors (帮助)