Zanthoxylum chalybeum Engl.
var. chalybeum

Burrows, J.E. & Willis, C.K. (eds) (2005). Plants of the Nyika Plateau Southern African Botanical Diversity Network Report No. 31 SABONET, Pretoria Page 256. as Zanthoxylum chalybeum (Includes a picture).

Burrows, J.E., Burrows, S.M., Lötter, M.C. & Schmidt, E. (2018). Trees and Shrubs Mozambique Publishing Print Matters (Pty), Cape Town. Page 360. (Includes a picture).

Drummond, R.B. (1975). A list of trees, shrubs and woody climbers indigenous or naturalised in Rhodesia. Kirkia 10(1) Page 248. As Fagara chalybea

Drummond, R.B. (1981). Common Trees of the Central Watershed Woodlands of Zimbabwe. Natural Resources Board, Harare. Pages 100 - 101. (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 75.

Mendonça, F. A. (1963). Rutaceae Flora Zambesiaca 2(1) Page 188. As Fagara chalybea

Strugnell, A.M. (2006). A Checklist of the Spermatophytes of Mount Mulanje, Malawi Scripta Botanica Belgica 34 National Botanic Garden of Belgium Page 172.