Kepner, R. A., Bainer, R., & Barger, E. L. (1972). Principles of farm machinery (2nd ed.). Avi Pub.
芝加哥风格引文Kepner, Robert Allen, Roy Bainer, 与 E. L. Barger. Principles of Farm Machinery. 2nd ed. Westport, Conn: Avi Pub, 1972.
MLA引文Kepner, Robert Allen, et al. Principles of Farm Machinery. 2nd ed. Avi Pub, 1972.
警告：这些引文格式不一定是100％准确.