Remember to cross-reference your sources. Start with academic works by Daftary or Lewis, then explore the primary Persian chronicles. By doing so, you will move beyond the cliché of the "Assassin" and meet the real Hassan bin Sabah—a brilliant, ruthless, and deeply faithful theologian who changed the art of asymmetrical warfare forever.
: If you are writing in Urdu, Internet Archive hosts several classic texts, such as the biography by Mohammad Abdul Haleem Sharar and the book by Almas M.A. hassan bin sabah pdf