VOIGT, R. Issayas Tesfamariam, ትግርኛ ንዛረብ: Let’s Speak Tigrinya, Elementary Level, A First-Year Textbook, A Multidimensional Approach to the Teaching and Learning of Tigrinya As a Foreign Language. Aethiopica, v. 23, p. 308–314, 20 Jul.2020.