These are the reference texts I use – some more often than others.
- ESV Bible (https://www.esv.org/)
- NET Bible (https://netbible.org/)
- NASB Bible
- A Greek-English Lexicon of the New Testament and Other Early Christian Literature (BDAG, 2nd Edition)
- The International Standard Bible Encyclopedia (1979). A free online edition (1939) is available at https://www.internationalstandardbible.com/.
- Holman Bible Atlas (1998)
- Classical Hebrew Poetry: A Guide to its Techniques (Wilfred G.E. Watson)
- Essential Truths of the Christian Faith (R.C. Sproul)
- The Story of Christianity (Justo L. Gonzalez)
- Early Christian Doctrines (J.N.D. Kelly)
- The Birth of the Church from Jesus to Constantine Vol. 1 (Ivor J. Davidson)