James Thompson points to a nice resource that I hadn't seen before. New Scientist, a glossy magazine, commissions short summaries on various scientific topics called "Instant Expert." Their "Instant Expert: Intelligence" entry was authored by the estimable Linda Gottfredson. (No paywall, now.)

You probably won't learn too much that's new, but it's a highly respectable-looking resource to link to when debating proponents of the anti-scientific conventional wisdom