Effects of Foot-in-the-Door, Cash Incentives, and Followups on Survey Response
研究了登门槛技术、现金激励和后续跟进对调查回应率的影响，发现现金激励显著提高回应率，而登门槛技术效果有限，对营销研究者设计调查有参考价值。
David H. Furse, David W. Stewart, David L. Rados, Effects of Foot-in-the-Door, Cash Incentives, and Followups on Survey Response, Journal of Marketing Research, Vol. 18, No. 4 (Nov., 1981), pp. 473-478