Brillo, Samuel C., Derek D. Cabactulan, and Michele Rodda. 2026. “Hoya sinagtala (Apocynaceae, Asclepiadoideae): A New, Unusual Species from the Philippines”. Phytotaxa 769 (3). Auckland, New Zealand:287-93. https://doi.org/10.11646/phytotaxa.769.3.6.