What is the Bible on Posing?

I don't think there is one. There are plenty of books out there on the subject, but I've never found one that wasn't a waste of time.

What I've learned (the hard way) over the years, is to make sure that your subject is comfortable with you. Being a people person with a sense of humour comes in handy. I'm not that outgoing normally, but I can fake it when I need to. I ask lots of questions and genuinely try to get to know the person a little. I will often act like a complete nutter to try get some laughs. I tell terrible jokes all of the time, pull stupid faces and just generally make a fool of myself and it really does help people to let their guard down.

Once they've relaxed a bit, and I have all my lighting set, I just sort of let them be themselves. If it's a shot that's more than a headshot, I try to give them an environment to inhabit and encourage them to move around inside of this little scene I have created. For instance, sitting sideways on a chair, one elbow resting on the back of the chair, while both hands fiddle with each other (If the hands are in the shot, I try to have them doing something). Things like that can go a long way to make your portraits appear to be more natural.

Another thing to do, would be to collect images that contain a pose that you like, either online or from magazines. Save them to your phone and reference them during a shoot. Also, don't be afraid to just show the image/pose to your subject and say "do this".

Seen a YouTube video recently (I think it might have been Mike Browne) and they recommend paying for an experienced model for a day or half a day and go through different poses with them and just have fun. An experienced model will teach you an awful lot.

What kind of posing are you talking about? Wedding or fashion/portrait? I don't think you'll find one that covers all the bases, as wedding posing is completely different to fashion/glamour etc. Youtube is your best option unless you want to pay for one?

To answer your question, I have found this book useful when I was starting out. But as mentioned, youtube contains lots of free info too!

I did find this;

I find this site fascinating as it shows both the pose and the lighting used to get that picture.

http://strobox.com/photos