کتاب زندگانی چهارده معصوم (ع) (14 1) ترجمه انگلیسی جلد 14 اثر مهدی آیت الهی نشر انتشارات انصاریان

The twelveth Imam (a.s.) was born in the midst of month of Shabaan Year 255 Hijra and this enlightened and brightened the hearts of shias. The Abbasade caliphs and government officials had heard that Imam's were twelve people and hat the last and final one was the son of Hassan Askari (a.s.) whose occultation will prolong, and he was the one who would form the world government.