Longitudinal trajectories of social reticence with unfamiliar peers across early childhood
Developmental Psychology (2014) - Comment
pubmed: 25181648  doi: 10.1037/a0037751  issn: 1939-0599  issn: 0012-1649 

Kathryn A. Degnan, Alisa N. Almas, Heather A. Henderson, Amie Ashley Hane, Olga L. Walker, Nathan A. Fox