Mainly the holy book Quran
The Quran and hundreds of other books
There are no official symbols of Islam. With that being said, some would say the most common symbols that represent Islam are the Star and Crescent. But there are findings in the Quran that specify that either are legitimate official symbols of Islam.
Islam is the official religion of Muslims. Refer to questions below for more information.
Official religion of Iran is Shiite Islam, specifically Twelver Shiite Islam with the Jaafari School of Fiqh (jurisprudence).
It is worth noting that Muslims claim that the Islamic Establishment did not write any of Islam's Holy Books. They attribute authorship entirely to God through acts of revelation to prophets. Islam's chief holy book is the Qur'an.
Islam is the official religion in Afghanistan.
Please read the Noble Quran, and other books of the sayings of the prophet Mohamed (Hadeeth Books); refer to link below for more books on Islam.
Islam
Islam
Islam
Islam
The special books of islam are the Quran and the Sunna