Ṣabra, ʿ. I. (1984). Maʿālim at-takāmul al-qaumī wa'l-ḥaḍārī qabla 'l-Islām wa-daur al-Yaman. Wizārat al-Iʿlām wa'ṯṮaqāfa.
Chicago Style (17th ed.) CitationṢabra, ʿAlī Ibn-ʿAlī. Maʿālim At-takāmul Al-qaumī Wa'l-ḥaḍārī Qabla 'L-Islām Wa-daur Al-Yaman. [Ṣanʿāʾ]: Wizārat al-Iʿlām wa'ṯṮaqāfa, 1984.
MLA (8th ed.) CitationṢabra, ʿAlī Ibn-ʿAlī. Maʿālim At-takāmul Al-qaumī Wa'l-ḥaḍārī Qabla 'L-Islām Wa-daur Al-Yaman. Wizārat al-Iʿlām wa'ṯṮaqāfa, 1984.
Warning: These citations may not always be 100% accurate.