@article{Cumming1961,
author = {Cumming, E. and Schneider, D.M.},
title= {Sibling Solidarity: A Property of American Kinship1},
year = {1961},
doi = {10.1525/aa.1961.63.3.02a00030},
journal = {American Anthropologist},
volume = {63},
number = {3},
pages = {498--507},
}