Lee Odell is the author of Elements of Language, a helpful guide for understanding how language works. They focus on clear explanations of linguistic concepts.
Susan M. Katz specializes in academic writing guides. She is the author of the popular "Writing Now" series, including "Writing Now with 2009 MLA and 2010 APA Updates," and also wrote "Portfolio Keeping 2e." Her books offer clear, practical instruction for students.