National College of Agricultural Engineering. (1971). Manual broadcast sower (schedule). National College of Agricultural Engineering].
芝加哥风格引文National College of Agricultural Engineering. Manual Broadcast Sower (schedule). [Silsoe, Eng.: National College of Agricultural Engineering], 1971.
MLA引文National College of Agricultural Engineering. Manual Broadcast Sower (schedule). National College of Agricultural Engineering], 1971.
警告：这些引文格式不一定是100％准确.