Atta)游牧部落征服後又被摧毁。 Lightfoot & Miller 1996 Boone, James L.; Myers, J. Emlen; Redman, Charles L., Archeological and Historical Approaches to Complex Societies
Harold Spencer. John Stanley Plaskett, 1865-1941. The Royal Society. 1 November 1942, 4 (11): 67–82. doi:10.1098/rsbm.1942.0007 . Redman, R. O. Y Cygni.
中国大百科全书出版社. 1998. ,第137页。 Redman, Joseph "The British Stalinists and the Moscow Trials", Labour Review, 3:2, March–April 1958 John Mahon, Harry Pollitt: A