https://www.marxists.org/archive/lenin/works/1916/imp-hsc/
https://www.marxists.org/chinese/maozedong/marxist.org-chinese-mao-193805.htm
https://www.marxists.org/chinese/linbiao/mia-chinese-linbiao-19661216.htm
https://www.marxists.org/deutsch/archiv/marx-engels/1848/manifest/0-einleit.htm
https://www.marxists.org/russkij/trotsky/works/trotl004.html
https://www.marxists.org/russkij/trotsky/works/trotl016.html#st02