You may the three refereed journals useful if you have the online access to sciencedirect/elsevier and EBSCO databases at all.
English for Specific Pursposes
English for Academic Pursposes
Written Communication
City U of Hong Kong and Michigan U are two institutions well-known for academic discourse research (Ken Hyland, V. Bhatia, Amy Tsui, Flowerdew, Joseph Hung, John Swales, Rita Simpson et al).