Haurongo: Fels, Willi
He whakaaturanga anō
Rārangi pukapuka
Brasch, C. O. Indirections. Wellington, 1980
Skinner, H. D. Willi Fels. Dunedin, 1946
Strathern, G. M. 'Fels, Willi, CMG'. In An encyclopaedia of New Zealand. Ed. A. H. McLintock. Wellington, 1966