Referensi
Cavell, A. J. (1954). A rapid method for the determination of nitrogen, phosphorus and potassium in plant materials. Journal of the Science of Food and Agriculture, 5(4), 195–200. https://doi.org/10.1002/jsfa.2740050407
Prins, J., van der Wilt, F., van Santen, S., van der Veen, C., & Hovinga, D. (2023). The importance of play in natural environments for children’s language development: an explorative study in early childhood education. International Journal of Early Years Education, 31(2), 450–466. https://doi.org/10.1080/09669760.2022.2144147
Sagastui, J., Herrán, E., & Anguera, M. T. (2020). A Systematic Observation of Early Childhood Educators Accompanying Young Children’s Free Play at Emmi Pikler Nursery School: Instrumental Behaviors and Their Relational Value. Frontiers in Psychology, 11(July), 1–12. https://doi.org/10.3389/fpsyg.2020.01731
Winnicott, D. W. (1953). Playing & Reality - Chapter 1: Transitional Objects and Transitional Phenomena. International Journal of Psycho-Analysis, 34(2), 1–18.
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