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Psychological Reports|November 6, 2008
Normative data for Raven's Coloured Progressive Matrices scale in YemenOmar Khaleefa, Richard LynnJournal of Biosocial Science|November 18, 2008
An increase of intelligence in Sudan, 1987-2007Omar Khaleefa, Afra Sulman, Richard LynnJournal of Biosocial Science|February 22, 2013
Normative data for IQ, height and head circumference for children in Saudi ArabiaAdel A Batterjee, Omar Khaleefa, Khalil Ashaer, et al.Pageof 1