Blundell Rules Limited (Firm). (1949). Slide rules instruction booklet. Blundell Rules Limited.
芝加哥风格引文Blundell Rules Limited (Firm). Slide Rules Instruction Booklet. Luton, U.K.: Blundell Rules Limited, 1949.
MLA引文Blundell Rules Limited (Firm). Slide Rules Instruction Booklet. Blundell Rules Limited, 1949.
警告：这些引文格式不一定是100％准确.