In this YouTube video, David Taylor at the University of Maryland University College gives a practical, clear explanation of the process. The sound isn't high quality, but his presentation is. 5:22 minutes.
A list of questions to ask when evaluating an article for a literature review, written by Naomi Lederer at the Colorado State University Libraries.
Resources at the UNT Libraries
The UNT Libraries have a wealth of print and e-books about writing proposals and literature reviews. To find additional titles, do a keyword search for [dissertation proposal] or for [thesis proposal] in the UNT library catalog. You can make a search specific to your field by conducting a keyword search including that term, e.g., [dissertation proposal social science].