Author not established. University of Asmara. Date not established. EHREA archive: /library/documents/doc-e8cc618f701a33cf14532c18/
[1] University of Asmara. Original source: http://www.ehrea.org/univofasmara.php. Preserved original: /library/originals/ef9ed03a733206a8b4423a4c68206959ac581e89ebb33cb020199ddf56c9db67.html. SHA-256: ef9ed03a733206a8b4423a4c68206959ac581e89ebb33cb020199ddf56c9db67