The Ebrary Academic Complete database has a number of books on how to write research proposals. Use the following search keywords in your search:
Proposal writing for grants
Henk Van Ekelenburg. "The Art of Writing Good Research Proposals." Science Progress 93:4 (Nov. 2010): 429.
Guidelines on Writing a Research Proposal by Matthew MacGranaghan, University of Hawaii (Last updated 16 December 2014)
Foundation Center, Proposal Writing Short Course This is focused on grant proposals, which has many common elements with research proposals. Also, check out the link Requests for Proposals from the Foundation Center.