Cite
MLA (8th Edition)
Africa 1:2,000,000, Series 2201. Sheet 20, Ādīs Ābeba. The Center, 1980.
APA (7th Edition)
Africa 1:2,000,000, Series 2201. Sheet 20, Ādīs Ābeba. (1980). The Center.
Chicago (17th Edition)
“Africa 1:2,000,000, Series 2201. Sheet 20, Ādīs Ābeba.” Washington, D.C.: The Center, 1980.