The Holy Spirit, first and foremost, closely followed by The Holy Bible
Exploring Heavenly Places, Volume 8: Dreamspeak, by Barbara Parker and available at http://aslansplace.3dcartstores.com/Exploring-Heavenly-Places-Volume-8–Dreamspeak–Barbara-Parker–Paperback_p_586.html
Unraveling the Mystery of Dream Interpretation, by Barbara Parker, is a four-hour seminar that was recorded at Aslan’s Place, which includes comprehensive information regarding dreams as well as discussion of dreams submitted by the audience. Available at http://aslansplace.com/language/en/unraveling-the-mystery-of-dream-interpretation-barbara-parker/
The Divinity Code to Understanding Your Dreams and Visions, by Adrian Beale and Adam F. Thompson, is an all-inclusive book that provides a biblical understanding of dreams and visions, practice interpretations, and an extensive metaphor dictionary; appendices and subject indexes make it easy to locate specific information.
A to Z Dream Symbology Dictionary, by Dr. Barbie L. Breathitt is a comprehensive collection of dream symbols that is conveniently arranged alphabetically.
If This Were a Dream, What Would It Mean? by Murray Dueck, is a book that encourages the reader to learn to examine actual events as if they were dreams in order to begin to understand more of what God is doing in everyday life.
The Dictionary of Biblical Imagery, edited by Leland Ryken, James C. Wilhoit and Tremper Longman III, explores images, symbols, motifs, metaphors, figures of speech, and literary patterns of the Bible.
The Prophet’s Dictionary, by Paula A. Price, Ph.D., is a reference book containing over 1,600 terms and phrases that are relevant to the prophetic realm.
Internet Search Engines are very helpful to research words, names, places, people, etc. who appear in a dream.
(Recommended books are available on Amazon as well as other websites.)