Look for a book or chapter that's relevant to your research in the Oxford Handbooks Political Science Collection.
Academic Writing for Graduate Students: Essential Tasks and Skills (2004) by John M. Swales and Christine B. Feak
Telling a Research Story: Writing a Literature Review (2009) by John M. Swales and Christine B. Feak
Doing a Literature Review: Releasing the Social Science Research Imagination (1998) by Chris Hart
Synthesizing research : a guide for literature reviews (1998) by Harris Cooper
Writing Literature Reviews: A Guide for Students of the Social and Behavioral Sciences (1999) by Jose L. Galvan
The Craft of Research (2008) by Wayne C. Booth, Colomb, Williams - in print and online