Nelson, J. A., de Lucca Freitas, L. B., O’Brien, M., Calkins, S. D., Leerkes, E. M., & Marcovitch, S. (2012). Preschool-aged children’s understanding of gratitude: Relations with emotion and mental state knowledge. Br J Dev Psychol.

Nelson, Jackie A., Lia Beatriz de Lucca Freitas, Marion O’Brien, Susan D. Calkins, Esther M. Leerkes, ja Stuart Marcovitch. "Preschool-aged Children’s Understanding of Gratitude: Relations With Emotion and Mental State Knowledge." Br J Dev Psychol 2012.

Nelson, Jackie A., et al. "Preschool-aged Children’s Understanding of Gratitude: Relations With Emotion and Mental State Knowledge." Br J Dev Psychol 2012.