Primary Source:

Audio message from Jabhat al-Nuṣrah’s Abū Muḥammad al-Jawlānī: “About the Fields of al-Shām”

Ahmad Muaz al-Khatib (post 1 and post 2)

Secondary Sources:

In Syria, the Jihadist Campaign for Hearts and Minds | TIME.com

Al Nusrah Front leader renews allegiance to al Qaeda, rejects new name – The Long War Journal

Nusra Front members in Syria have never masked al Qaida ties | McClatchy

Jabhat al-Nusra Declares Allegiance to Al-Qaeda – Al-Monitor: the Pulse of the Middle East