How the Prophets made dua. This web site is for people of various faiths who seek to understand Islam and Muslims.  It contains a lot of brief, yet informative articles about different aspects of Islam.  New articles are added every week.  Also, it features Live Help through chat.

Source: Dua (Supplication) (part 4 of 4): Even Prophets feel distress and turn to God – The Religion of Islam