The complete life of Hazrat Mohammad Mustafa Salle Ala Alaihi wasallam was sunnah. What ever he did, is sunnah and is ideally to be followed by Muslims.
The Utterances and Practices of the Holy Prophet called Sunnah.
Sunnah is what Holy Prophet SAW did in His life and Hadith is what He did and told us to follow him.
Holy Quran and Sunnah (Prophet Muhammad sayings and practices)
The Holy Qur'an and the Sunnah (sayings and actions of Prophet Muhammad - peace be upon him).
They are called Sunnah.
Sunnah Is what the prophet (pbuh) insisted that we do or practise, so if he insisted on it then it is sunnah, there are various books on the sunnah of the prophet (pbuh) or you can check it out online at various sites.
Hadith is what Prophet Muhammad (pbuh) said while Sunnah is what he (prophet) did.
Muslims use the God holy book Quran. They follow also Sunnah (that is prophet Muhammad PBUH saying and practices)
The main sourses of Fiqh are the holy Quran and the Sunnah of prophet Mohammed peace be upon which explains the Quran.
If you mean by 'attahyat' what is recited by the Muslim in the prayers then this is not mentioned in the holy Quran but it was taught by the prophet Muhammad PBUH in His Sunnah.
God Quran holy book and prophet Muhammad (PBUH) sayings and practices (called Sunnah).
Basically, you find Islam teachings in Quran (holy book of Muslims) and Prophet Muhammad Sunnah (sayings and practices).