Free/Freebies . Free Bible Study Aids, Tools, & Resources . Online Bible Study Tools
For those like myself who do not have any Seminary/Theology teaching/training it would be wise to study/read from Bible Study Tools. This is an awesome avenue to keep you from being deceived from false teachers and or from making a mistake in your learning and teaching.
A good source of study material could consists of: Concordances . Commentaries . Bible Dictionaries . Bible Handbooks . Language Tools . Study Bibles . Bible Maps & Charts . Archaeology Study Aids . Freebies/Free . Frugal
The Internet offers ... "free" ... online .... Bible Study Tools but choose them wisely.
Higher Praise Tools, Aids, & Resources ... http://higherpraise.com/
ehow Bible Study Tools Resources ... http://www.ehow.com/list_7224905_bible-study-tools.html
WordSearchBible Study Tools: Freebies ... https://www.wordsearchbible.com/products/free
Blue Letter Bible - http://www.blueletterbible.org
Bible Study Tools at Crosswalk - http://biblestudytools.com
Study Light - http://www.studylight.org
Bible Gateway - http://www.biblegateway.com
You could build a free reference library via of marking as 'favorites' or purchase your own paperback or ebooks from your favorite local bookstore or online.
With an economy that does not look so well to some I would suggest to become frugal when you can, but use and choose "truthful Biblical applications" for studying and researching the Scriptures. Some bookstores maybe in your local areas may even offer discounts or sales so watch out for this as well. Build a reference library.