William Aiton: Hortus Kewensis; or, a Catalogue of the Plants Cultivated in the Royal Botanic Garden at Kew. Band 2, London 1789, S. 427 (online).
botanicus.org
Supplementum plantarum Systematis vegetabilium editionis decimae tertiae, Generum plantarum editionis sextae, et Specierum plantarum editionis secunda. Seite 305, publ. 1782 (online).
sanbi.org
redlist.sanbi.org
Pelargonium tetragonum, In: National Assessment: Red List of South African Plants version 2013.1.
