Tolong jelaskan mengenai Sumber dalam talian dari Pertempuran Naqra dalam bahasa melayu

A.I. Akram, The Sword of Allah: Khalid bin al-Waleed, His Life and Campaigns Lahore, 1969

A.I. Akram, The Sword of Allah: Khalid bin al-Waleed, His Life and Campaigns, Nat. Publishing. House, Rawalpindi (1970) ISBN 0-7101-0104-X.