Penn, H. (2014). International Indicators as a Measure of National Policies. International journal of early childhood, 46(1), 33-46. https://doi.org/10.1007/s13158-013-0099-9
Citácia podle Chicago (17th ed.)Penn, Helen. "International Indicators as a Measure of National Policies." International Journal of Early Childhood 46, no. 1 (2014): 33-46. https://doi.org/10.1007/s13158-013-0099-9.
Citácia podľa MLA (8th ed.)Penn, Helen. "International Indicators as a Measure of National Policies." International Journal of Early Childhood, vol. 46, no. 1, 2014, pp. 33-46, https://doi.org/10.1007/s13158-013-0099-9.
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