Reference: Triulzi et al. 1976

Triulzi, Alessandro, Atieb Dafallah & Marvin Lionel Bender. 1976. Some notes on the Ethiopian Bertha and their language. Annali dell'Istituto Orientale di Napoli 26([36]). 1–23.

@article{triulzi1976bertha,
  author  = {Triulzi, Alessandro and Atieb Dafallah and Marvin Lionel Bender},
  journal = {Annali dell'Istituto Orientale di Napoli},
  number  = {[36]},
  pages   = {1–23},
  title   = {Some notes on the Ethiopian Bertha and their language},
  volume  = {26},
  year    = {1976}
}