Ibrahim, H. M., F. A. Alhadi, A. A. Murshed, and A. N. A. Al-Gifri. “Bidens Aurea (Asteraceae), a New Record to the Flora of Yemen”. PSM Biological Research, vol. 7, no. 1, Jan. 2022, pp. 1-13, https://psmjournals.org/index.php/biolres/article/view/599.