Author not established. Haile Woldentsae Drue. Date not established. EHREA archive: /library/documents/doc-ce43777b7ec824934fb1368e/
[1] Haile Woldentsae Drue. Original source: http://www.ehrea.org/Haile_Woldetensae1.pdf. Preserved original: /library/originals/63ba35860828db8ca843fe5e1e6528d7cdfc2b96df5f602def740d70208c9983.pdf. SHA-256: 63ba35860828db8ca843fe5e1e6528d7cdfc2b96df5f602def740d70208c9983