Each developer has his own programming style, based on his experience with various languages or in various working environments. Each person develops his/her own style based on many factors. You cannot MAKE someone follow strict guidelines for coding.
One possible solution, albeit with limited rate of success, would be to gather them and discuss the requirements, take feedback from them on their own style and try to find a compromise between these. Try submitting this compromise to your superiors or to those that compile the coding standards for your company.
Also, the developers should be told about the importance of coding standardization, without pressuring them into adopting your standard and into reading whole pages about how they should write their code. Communication is the best way to get a problem solved and a solution on the table. Without communication there is only chaos.
As has been suggested, you can also try a code style formatter prior to revision.
