Geisinger, Kurt F. (3 de julho de 2019). «Empirical Considerations on Intelligence Testing and Models of Intelligence: Updates for Educational Measurement Professionals». Applied Measurement in Education. 32 (3): 193–197. ISSN0895-7347. doi:10.1080/08957347.2019.1619564
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«CHC Theory». Consultado em 11 de junho de 2016. Arquivado do original em 6 de junho de 2016
Geisinger, Kurt F. (3 de julho de 2019). «Empirical Considerations on Intelligence Testing and Models of Intelligence: Updates for Educational Measurement Professionals». Applied Measurement in Education. 32 (3): 193–197. ISSN0895-7347. doi:10.1080/08957347.2019.1619564