@article{Molm2007,
author = {Molm, L.D. and Collett, J.L. and Schaefer, D.R.},
title= {Building solidarity through generalized exchange: A theory of reciprocity},
year = {2007},
doi = {10.1086/517900},
journal = {American Journal of Sociology},
volume = {113},
number = {1},
pages = {205--242},
}