Danis, I., V. Bóné, R. Hegedűs, A. Pilinszki, T. Szabó, and B. Dávid. “Infancy in 21st Century Hungary: A Project Introduction: Policy, Theoretical and Methodological Framework and Objectives of the First National Representative Parent Survey on Infant and Early Childhood Mental Health”. European Journal of Mental Health, Dec. 2020, pp. 111-44, https://ejmh.semmelweis.hu/test/index.php/ejmh/article/view/211.