Tavakol, A. (2009). Force Protection, Main Challenge of NATO in Afghanistan. Military Science and Tactics, 6(13), 5-14.

Tavakol, A. "Force Protection, Main Challenge of NATO in Afghanistan", Military Science and Tactics, 6, 13, 2009, 5-14.

Tavakol A. (2009). 'Force Protection, Main Challenge of NATO in Afghanistan', Military Science and Tactics, 6(13), pp. 5-14.

A. Tavakol, "Force Protection, Main Challenge of NATO in Afghanistan," Military Science and Tactics, 6 13 (2009): 5-14,

Tavakol A. Force Protection, Main Challenge of NATO in Afghanistan. Military Science and Tactics. 2009;6(13):5-14 (In Persian).