•
Outlines of a Nuer Grammar (1933) •
A Study of the Acooli Language (1938) •
The Lwoo (1950–54) •
Zur Gesellschaft und Religion der Nueer (1953) • ''A Study of the
Logbara (Ma'di) Language'' (1960) •
A Study of the Pokot (Suk) Language (1978) ==Bibliography==