“Units of Study in Opinion, Information, and Narrative Writing, Grade 3” is a trade paperback textbook written by Lucy Calkins, specifically designed for elementary school students in the subject area of writing skills. Published by Heinemann in 2015, this textbook focuses on teaching students how to write opinion, information, and narrative pieces with a beginner level of difficulty. The book measures 8.7 inches in length and 11 inches in width, providing a comprehensive resource for educators looking to enhance their students’ writing abilities in English language.