Sabry Amin 
Decencies of Islam in Diplomatic Behavior [PDF ebook] 

The decencies of Islam in diplomatic behavior constitute an integral part of the general decencies of etiquette in Islam. Islam regards the work of the diplomat from both the formal and substantive side, as the form and essence are indivisible in Islam; whereas we can say that the most important decencies of etiquette in Islamic Law are concerned of a lot of matters