These books are useful, are referred to elsewhere in this wiki, or both. The editions identified here are not necessarily the most recent.
The Bluebook: A Uniform System of Citation (20th ed. 2015).
Cristine Coughlin, Joan Malmud Rocklin & Sandy Patrick, A Lawyer Writes: A Practical Guide to Legal Analysis (2d ed. 2013).
Bryan A. Garner, The Redbook: A Manual on Legal Style (3d ed. 2013).
Interactive Citation Workbook for The Bluebook: A Uniform System of Citation (2018 ed.).
Bryan A. Garner & Henry Campbell Black, Black’s Law Dictionary
Mark K. Osbeck, Impeccable Research: A Concise Guide to Mastering Legal Research Skills (2d ed. 2016).
David S. Romantz & Kathleen Elliott Vinson, Legal Analysis: The Fundamental Skill (2d ed. 2009).