Andrew,
Sorry for the VERY long delay. The book was US Army Gunships in Vietnam, Arms and Armour Press.
Articles: I did two articles for Air Enthusiast Quarterly covering the development of the Huey and use in Vietnam, and one for Scale Aircraft Modelling detailing markings and unit organization, and 2 for Aviation News, one on my personal experiences and one on the A/ACH-47A Guns-A-Go Go, operational history.
Cheers,
Bob