Markus Jokela؛ G. David Batty؛ Ian J. Deary؛ Catharine R. Gale؛ Mika Kivimäki (2009). "Low Childhood IQ and Early Adult Mortality: The Role of Explanatory Factors in the 1958 British Birth Cohort". Pediatrics. ج. 124 ع. 3: e380–e388. DOI:10.1542/peds.2009-0334. PMID:19706576.
Markus Jokela؛ G. David Batty؛ Ian J. Deary؛ Catharine R. Gale؛ Mika Kivimäki (2009). "Low Childhood IQ and Early Adult Mortality: The Role of Explanatory Factors in the 1958 British Birth Cohort". Pediatrics. ج. 124 ع. 3: e380–e388. DOI:10.1542/peds.2009-0334. PMID:19706576.