The origins of reciprocity and social exchange in friendships.
Laursen
Brett
B
Florida Atlantic University, USA.
Hartup
Willard W
WW
D002648:Child; D002657:Child Development; D003071:Cognition; D005260:Female; D006801:Humans; D007398:Interpersonal Relations; D008297:Male; D010379:Peer Group; D011582:Psychological Theory; D012919:Social Behavior