1. Effects of the reciprocated help on the recipient’s estimation of the helper;Aikawa Atsushi;Japanese Psychological Research,1984
2. Relative weight of the recipient’s benefits and the donor’s costs in determining the magnitude of indebtedness;Aikawa Atsushi;Japanese Psychological Research,1988
3. The norm of reciprocity: A preliminary statement;Alvin W Gouldner;American Sociological Review,1960
4. “Why didn’t you just ask?” Underestimating the discomfort of help-seeking