Professors as Writers: A Self-Help Guide to Productive Writing, Robert Boice, 1990
Though this book is nearly 30 years old, much of the content is very relevant to anyone needing guidance about the writing process. Boice describes the components of how to start and continue writing.
The book is truly a self-help guide in that there are questions to help one assess personal challenges to writing, and exercises to establish productive strategies. He describes various types, such as spontaneous and generative writing. He also delves into why writers struggle: anxiety, lack of confidence, procrastination, inability to start or finish, and other psychological issues.
Boice’s manual is prescriptive, as it promotes a specific agenda to become a productive writer. Many authors, especially new or those who are required to write (e.g. for tenure) will find it helpful if they are continually challenged to make time for writing. Though mostly prescriptive, any writer can read it and glean tips that can be adapted to various writing processes.