Martin Fey, W. c. b. J. H. (2012). Soils of South Africa (1.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Martin Fey, With contributions by Jeff Hughes. Soils of South Africa. 1. Cambridge University Press, 2012.
Lua MLA (8ú heag.)Martin Fey, With contributions by Jeff Hughes. Soils of South Africa. 1. Cambridge University Press, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.