1997 IUCN red list of threatened plants (1997)

Annals of the Missouri Botanical Garden - Missouri Botanical Garden. (Missouri Botanical Garden Press)

Conservation and sustainable management of trees, report of the first regional workshop, held at Jameson Hotel, Harare, Zimbabwe 9-11 July, 1996 - WCMC (WCMC, 1996)

Famille des Sterculiacées - Hallé, Nicolas (1961)

Mémoires du Muséum national d'histoire naturelle. Série B, Botanique - Muséum national d'histoire naturelle (France) (Ed. du Museum, 1968)

Rare Tropical Timbers (1988)

The World List of Threatened Trees (1998)