This wonderful book (Angel Jibraeel returns again) for children regarding Surah Ad-Duha explains about it's history and about the Prophet (S). The book uses colorful illustrations which attract the attention of young readers', stimulate them and amuse them. At the end of the book there is a 1 page activity section which helps in testing the knowledge gained and to make learning interactive by using the following activities: 'True & False' section. This is a nice way of familiarizing young children with the concept of angels in Islam.

Other Sources:

An in depth description of the importance of studying the Prophet’s (PBUH) life

An in depth discussion of Islam and its principles