Template:Manktelow et al., 2001
- Manktelow, M., McDade, L.A., Oxelman, B., Furness, C.A. & Balkwill, M.-J. 2001. The Enigmatic Tribe Whitfieldieae (Acanthaceae): Delimitation and Phylogenetic Relationships Based on Molecular and Morphological Data. Systematic Botany 26(1): 104–119. JSTOR