Madelung 1997, p. 404 refers to Jufayna as "al-Naṣrānī", indicating that he was a man. Moreover, while the murder weapon seems to be depicted here as a split-blade sword (like Zulfiqar), El-Hibri 2010, p. 109 describes it as "a unique dagger", having "two pointed sharp edges, with a handle in the middle". The picture is taken from Tārīkhunā bi-uslūb qaṣaṣī ('Our History in a Narrative style'), a popular history book first published in Iraq in 1935. Madelung, Wilferd (1997). The Succession to Muhammad. Cambridge University Press. El-Hibri, Tayeb (2010). Parable and Politics in Early Islamic History: The Rashidun Caliphs. New York: Columbia University Press. ISBN978-0-231-15082-8.