2 literature references for Indigofera burttii Baker f.:

Author: Gillett,J.B. et al.
Year: 1971
Title:
Source: Papilionoideae.In:Fl.Trop.E.Africa,Milne-Redhead & Polhill
Author: Gillett,J.B.
Year: 1958
Title:
Source: Kew Bull.Addnl.ser.1:1-166.Indigofera..in Tropical Africa.