There are many articles on corporate reputation management, however what most them offer is based on traditional SEO practices which are often highly dubious and in many instances outright ineffective.
The main reason for this is that over the years Google has taken ever increasing measures to remove spam from the search results and what was until recently considered standard practice SEO advice such as listing your site in directories, or doing article submissions, or link swapping, etc. etc. are now practices which are almost totally ineffective as Google now recognize these 'techniques' and have taken extreme measures against them, in many cases penalizing companies which used such methods.
Thus what was recommended in articles and on forums or by professional agencies six months ago will probably not only be ineffective but could instead actually cause further damage.
Therefore the best way to get up-to-date and effective information regarding managing your corporate online reputation is to contact a professional company with experience in this sector who can carefully analyze your brands weaknesses and implement effective solutions to ensure you are in total control of how you are perceived online.