When it comes to searching for materials on a particular subject, there are several synonyms for the phrase "book on." Some common alternatives include "text on," "guide to," "manual for," "publication regarding," and "tome about." Additionally, one could use the terms "literature about," "study of," "analysis of," or "research into" to indicate a more academic or in-depth approach to the topic. It's important to consider the context in which these phrases are used and tailor them appropriately. Whether seeking out a comprehensive guide or a specific analysis of a topic, there are many ways to express the idea of a "book on" a subject.