Fiqh As-Sunnah by Sayyid Sabiq
The Lawful And The Prohibited In ISLAM by Sh. Qaradawi-- Note: Use this guide to the weak hadeeth when reading this book
Islam-Question and Answer: Get your questions on Islam answered by Sheikh Muhammed Salih Al-Munajjid
Fatawas by Sh. Bin Baz and Other Scholars
Articulating the Intention by Imaam Ibn Taymiyyah
Fatwaa on Unification
of Religions