Search for 'Aleister Crowley' on Google Scholar and you find some interesting papers apart from the usual books. Here are a few that I haven't yet read and that look intriguing:
The Sorcerer and His Apprentice: Aleister Crowley and the Magical Exploration of Edwardian Subjectivity. Alex Owen. Journal of British Studies, Vol. 36, No. 1 (Jan., 1997) , pp. 99-133
Secret Agent 666: Aleister Crowley and British Intelligence in America, 1914-1918. Richard B. Spence. International Journal of Intelligence and CounterIntelligence. Volume 13, Number 3 / October 1, 2000.
The Neverendingly Told Story: recent biographies of Aleister Crowley. Marco Pasi. Journal for the Study of Western Esotericism. Volume 3, Number 2. July 2003