Squires, J., Bricker, D., & Twombly, E. (2015). Ages & Stages Questionnaires®: Social-Emotional, Second Edition (ASQ®:SE-2): A Parent-Completed Child Monitoring System for Social-Emotional Behaviors. Baltimore: Paul H. Brookes Publishing Co., Inc.
Squires, J., & Bricker, D. (2009). Ages & Stages Questionnaires®, Third Edition (ASQ®-3): A Parent-Completed Child Monitoring System . Baltimore: Paul H. Brookes Publishing Co., Inc.