Reference: Roper 1928

Roper, E. M. 1928. Tu Beḍawiɛ an elementary handbook for the use of Sudan government officials. Hertford UK: Stephen Austin & Sons.

@book{roper1928handbook,
  address   = {Hertford UK},
  author    = {Roper, E. M.},
  publisher = {Stephen Austin & Sons},
  title     = {Tu Beḍawiɛ an elementary handbook for the use of Sudan government officials},
  year      = {1928}
}