@inbook{Stevenson-Hinde1993,
author = {Stevenson-Hinde, J. and Shouldice, A.},
title= {Wariness to strangers: A behavior systems perspective revisited},
year = {1993},
editor = {Rubin, K.H.},
editor = {Asendorpf, J.B.},
booktitle = {Social withdrawal, inhibition, and shyness in childhood},
address = {Hillsdale, NJ},
publisher = {Erlbaum},
pages = {101--116},
}