For general stuff, I'd read "The 48 Laws of Power". The reality is that every situation is different... it's the ability to change approaches and the knowledge base/experience that will help, not a ruleset.How do you know this? Is there a book or something? I've always felt blindsided when confronted with workplace bullies. For once I want to be armed in advance.
The other side is that in many cases, bullying should not be the word on uses. There are very few work bullies - most are simply confrontational and unpleasant (ie: very T, goal orientated, self serving) which is an entirely different beast than actual bullies (like in the OP). It's normal to project the situation and situations are better resolved (either directly or indirectly) when seen for what they are.
So, that's what I would suggest. Flex the emotionless muscle, distance yourself, tame the emotional reaction... Then work on thinking strategically - where do you want the situation to end up and how to do resolve it. Once you reach that point you will need to get beyond hesitation and aim for carrying through. Those are more or less the three core steps - remove emotion, learn to strategize, learn to implement.
(FWIW, INFPs hurt for these three steps - it's very much against your nature... so it wont' be easy. However, the way you do it can differ for your own style, INFPs would normally prefer undermining and passive aggressive tendencies... but those are riskier which is why they aren't normally used. It depends on what you want - for pure defense you should be fine, but if you want to climb the corporate ladder, you'll need a very different approach... one that might not sit well.)