It's a college composition textbook, How to Write Anything: A Guide and Reference with Readings, 4th edition, by John J. Ruszkiewicz and Jay Dolmage (Bedford/St. Martin's, 2015). The book combines a genre-focused writing guide with reference chapters covering skills like research and citation, along with sample readings such as the narrative models that appear throughout.
Picture a student assigned a persuasive essay. They check the guide's genre section for argument essays, turn to the reference for thesis help, and study a model essay in the readings. The distinction to keep in mind is that this is a description of one specific book, not a stand-in for writing instruction in general. The book itself does teach writing, including process guidance in its reference chapters, but what this entry explains is what that particular textbook contains and how its three parts are meant to be used.
Now the paper needs sources, say a claim about grocery prices. The guide points you to the reference part, where chapters cover research, MLA and APA citation, and grammar. Say your teacher asks for a short narrative about a first job. You flip to the genres part of the guide, find the narrative chapter, and read Leah Vann's piece Bald Is NOT Beautiful, a personal story shaped to make an argument, to see how one student handled the assignment.