Moshman's book is still the bible as far as I'm concerned. The strategies outlined are undoubtedly still good enough to beat micro/small stakes sngs. There's a decent section on sngs in 'Kill Everyone'. It's a bit more advanced though. Haven't read Mike Turner's book.
Consider investing in SNG wiz if you don't have it already. There's a ton of good training videos available on youtube. Have a look at this site;
http://www.sitandgoplanet.com/