Soma, Y., Nakamura, K., Oyama, M., Tsuchiya, Y., & Yamamoto, M. (2009). Prevalence of attention-deficit/hyperactivity disorder (ADHD) symptoms in preschool children: Discrepancy between parent and teacher evaluations. Springer Japan.

Soma, Yukio, Kazutoshi Nakamura, Mari Oyama, Yasuo Tsuchiya, i Masaharu Yamamoto. Prevalence of Attention-deficit/hyperactivity Disorder (ADHD) Symptoms in Preschool Children: Discrepancy between Parent and Teacher Evaluations. Springer Japan, 2009.

Soma, Yukio, et al. Prevalence of Attention-deficit/hyperactivity Disorder (ADHD) Symptoms in Preschool Children: Discrepancy between Parent and Teacher Evaluations. Springer Japan, 2009.