The Four Principles Regarding Shirk by Muhammad Ibn Abdul-Wahhab

Free eBook available

Salafi Publications Resources:

• The Four Principles by Shaikh ul-Islaam Ibn Abdul-Wahhaab
  Includes English translation of the Explanation by Shaikh Salih ibn Fawzaan ibn ‘Abdullaah Aali Fawzaan (may Allah preserve him).

Additionally, there are 

• شرح القواعد الاربعة – الشيخ صالح الفوزان  
  5 lessons – Audio recordings by Shaikh Salih ibn Fawzaan ibn ‘Abdullaah Aali Fawzaan (may Allah preserve him).
• PDF Document
  Full Arabic text with tashkeel at Bakkah.net