1. New species of Hoya (Apocynaceae –Asclepiadoideae) from Sabah, Malaysia Hoya ranauensis, sp. n.;Green;Hoya New,2014
2. Notes on the taxonomy and ecology of the genus Hoya (Asclepiadaceae) in Central Sulawesi.;Kleijn;Blumea,2001
3. The Hoyas of Sabah, a commentary with seven new species and a new subspecies.;Lamb;Sandakania,2014