Reference

Definitions:

Atheism (الإلحاد): rebelling against religion and denying it and divorcing it from general life.
Intermediaries (وسائط): all maters regarding what man presumes to be forms of worship that draw him closer to Allah.
Divine Evidence (الأدلة السمعية): Scriptural evidence from Quran and Sunnah.
Caverns (الغيران): underground areas similar to caves in the mountain.
Remedy (الشفاعة): seeking an intermediary to obtain benefit.

Reference

1. The Concise Collection of Authentic (hadeeth): al-Razi
2. The Illuminating Lamp: al-Fayyumi
3. The Foundation of Eloquence: al-Zamakhshari
4. The Encompassing Dictionary: al-Fayruz al-Abaadi
5. The Treatise of the Annulments to Islam: Muhammad ibn Abd al-Wahaab
6. Explanation on the Annulments of Tawheed: al-Awaaji
7. The Salafi Belief of Sheikh Muhammad ibn Abd al-Wahhaab and its Impact in the Muslim World:
    Saleh al-Abood
8. The Easy Facilitation of the All Might the All Praised: Sulayman ibn Abd Allah
9. The Concise in Fundamental Questions and Answers on al-Wasitiyyah Belief: al-Salman
10. The Pertinent Words: Abd al-Rahman al-Sa’di
11. The Compilation of Major Treatise: Ibn Taymiyyah.
12. The Path of Acceptance: al-Hakami.
13. Purely Beneficial Monotheism: Ahmad ibn Ali al-Maqrizi