Nowak, C.; Heinrichs, N. (2008). "A comprehensive meta-analysis of Triple P-Positive Parenting Program using hierarchical linear modeling: Effectiveness and moderating variables". Clinical Child and Family Psychology Review. 11 (3): 114–144. doi:10.1007/s10567-008-0033-0. PMID18509758. S2CID19142200.
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Nowak, C.; Heinrichs, N. (2008). "A comprehensive meta-analysis of Triple P-Positive Parenting Program using hierarchical linear modeling: Effectiveness and moderating variables". Clinical Child and Family Psychology Review. 11 (3): 114–144. doi:10.1007/s10567-008-0033-0. PMID18509758. S2CID19142200.
Nowak, C.; Heinrichs, N. (2008). "A comprehensive meta-analysis of Triple P-Positive Parenting Program using hierarchical linear modeling: Effectiveness and moderating variables". Clinical Child and Family Psychology Review. 11 (3): 114–144. doi:10.1007/s10567-008-0033-0. PMID18509758. S2CID19142200.