Author not established. Tes_University of Asmara. Date not established. EHREA archive: /library/documents/doc-7c3320eae99df1367e701b1d/
[1] Tes_University of Asmara. Original source: http://www.ehrea.org/060830_AsmaraUniversity_Tes.pdf. Preserved original: /library/originals/aeda1f0bd8b9d89de84dd3ff81b88a63dee2877b1df0a64eb5af1d7e9b5204c0.pdf. SHA-256: aeda1f0bd8b9d89de84dd3ff81b88a63dee2877b1df0a64eb5af1d7e9b5204c0