Gerin, JL; Houghton, M. Structure, sequence and expression of the hepatitis delta (delta) viral genome. Nature. 9 October 1986, 323 (6088): 508–14. Bibcode:1986Natur
ISSN 1361 4231. Forsyth, Kevin S. Delta: The Ultimate Thor. In Roger Launius and Dennis Jenkins (Eds.), To Reach The High Frontier: A History of U.S. Launch
thebiafraherald.co. The Biafra Herald. [2016-06-27]. (原始内容存档于2021-11-09). Joint Niger Delta Liberation Force: Why are new militant groups emerging in Nigeria?.