Trapa natans L.
var. bispinosa (Roxb.) Makino

Baumann, G. (2005). Photographic Guide to Wildflowers of Malawi Wildlife and Environmental Society of Malawi Pages 58 - 59. as Trapa natans (Includes a picture).

Brenan, J.P.M. (1978). Trapaceae Flora Zambesiaca 4 Pages 346 - 348. (Includes a picture).

Da Silva, M.C., Izidine, S. & Amude, A.B. (2004). A preliminary checklist of the vascular plants of Mozambique. Southern African Botanical Diversity Network Report No. 30 Sabonet, Pretoria Page 115.

Ellery, K. & W. (1997). Plants of the Okavango Delta, a Field Guide Tsaro Publishers, Durban, South Africa Page 149. (Includes a picture).

Mapaura, A. & Timberlake, J. (eds) (2004). A checklist of Zimbabwean vascular plants Southern African Botanical Diversity Network Report No. 33 Sabonet, Pretoria and Harare Page 81.

Phiri, P.S.M. (2005). A Checklist of Zambian Vascular Plants Southern African Botanical Diversity Network Report No. 32 Page 101.

Pooley, E. (1998). A Field Guide to the Wild Flowers of KwaZulu-Natal and the Eastern Region. Natal Flora Publications Trust. Durban. Pages 540 - 541. as Trapa natans (Includes a picture).

Roodt, V. (2011). Wild flowers, Waterplants and Grasses of the Okavango Delta and Kalahari "Did You Know" nature series Struik Nature for Veronica Roodt Publications Page 42. (Includes a picture).

Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 109.

Timberlake, J.R. & Childes, S.L. (2004). Biodiversity of the Four Corners Area: Technical Reviews Volume Two (Chapter 5-15) Appendix 5-1: Plant Checklist Occasional Publications in Biodiversity 15 Page 193.