John Booth, "Fifteen Years on from 9/11" [external PDF], Lobster Magazine (Winter 2016)

If you're interested in finding a concise, well-written, unsensational and informative introduction to the subject of 9/11 Studies, then I highly recommend John Booth's recently-published essay in Lobster Magazine. John — a freelance journalist who has worked for news organisations in Africa, the UK and the US — helpfully casts a wide net across the field and, with copious references and hyperlinks to key pieces of information, provides a very valuable resource for further study.