Hi Oxygen, are you asking specifically about technique for oral sex, or just bring her to orgasm somehow?
In that case (especially about technique) we're going to direct you to these two resources from our friends Lee Jenkins and Michael Webb (who are regular contributors here on AskDanAndJennifer.com):
1.
How To Give Her Mind Numbing, Leg Shaking Orgasms - The Female Orgasm Black Book - this one is very, very important; it's not just about oral sex, but rather about all the sex positions (and yes also fingering techniques - most guys don't realize they can please a woman with their hands as well) to try that are more likely to result in her having an orgasm during sex. As I like to say, "there's nothing more giving than a satisfied woman". :)
2.
How to Go Down on a Woman and Have Her Begging for More - Lick by Lick - this is specifically about giving your wife/girlfriend oral sex, and the best techniques, etc.