Singh, R. (1987). Farm production in rainfed sub-mountains Punjab. B.R. Publishing.
芝加哥风格引文Singh, Rachhpal. Farm Production in Rainfed Sub-mountains Punjab. Delhi: B.R. Publishing, 1987.
MLA引文Singh, Rachhpal. Farm Production in Rainfed Sub-mountains Punjab. B.R. Publishing, 1987.
警告：这些引文格式不一定是100％准确.