EU OSHA has created a whole e-guide about managing work-related stress. See the guide at: https://www.healthy-workplaces.eu/en/tools-and-resources/a-guide-to-psychosocial-risks. However, there is very little in the guide about effective interventions and what little there is is based on conjecture alone and not on the latest scientific evidence. Good example of omitted sources of reliable and directly applicable evidence is this Cochrane review: http://onlinelibrary.wiley.com/doi/10.1002/14651858.CD002892.pub3/abstract.

Update 2014-12-03