While not specifically on writing action research this article helps lay the ground for writing on action research.
Marshall, J. (2008) ‘Finding form in writing for action research, in P. Reason and H. Bradbury, (eds) The SAGE Handbook of Action Research, 2nd edition. London: SAGE. pp. 682-695.
This is a valuable chapter that explores forms of writing and, particularly, how to use the first person element in writing on action research.
Encyclopedia of Action Research: Disseminating action research, Dissertation writing
These entries provide solid information on writing up action research for both a dissertation and for publication.