This depends on whether your works have been published and if so, the agreements that you signed with the publisher. If you retained copyright, you can copy, distribute, adapt, translate, republish and do all the other things protected by copyright. You can also give or withhold permission for others to do these things, at your discretion. If you signed copyright over to a publisher, then the publisher has the right to allow copies or uses to be made of the work, and you must request permission from the publisher to reproduce it. Sometimes publishers will grant some rights back to authors in their agreements; check your agreement or contact your publisher to see what rights you may have retained.