% pubman genre = article
@article{item_1878220,
title = {{The opportunity to collaborate increases preschoolers{\textquoteright} motivation for challenging tasks}},
author = {Butler, Lucas P. and Walton, Gregory M.},
language = {eng},
issn = {0022-0965},
doi = {10.1016/j.jecp.2013.06.007},
publisher = {Academic Press},
year = {2013},
date = {2013-12},
journal = {{Journal of Experimental Child Psychology}},
volume = {116},
number = {4},
pages = {953--961},
}