Helfant, S. (1969). Training and motivating retail sales people. Independent Stores Division, National Retail Merchants Association.
芝加哥风格引文Helfant, Seymour. Training and Motivating Retail Sales People. New York: Independent Stores Division, National Retail Merchants Association, 1969.
MLA引文Helfant, Seymour. Training and Motivating Retail Sales People. Independent Stores Division, National Retail Merchants Association, 1969.
警告：这些引文格式不一定是100％准确.