Considered as a foundational document, presented are links to various formats of the Manifesto of the Communist Party
https://www.marxists.org/archive/marx/works/1848/communist-manifesto/
PDF version:
https://www.marxists.org/archive/marx/works/download/pdf/Manifesto.pdf
Audio:
https://www.marxists.org/audiobooks/archive/marx-engels/communist-manifesto/index.htm
Ebook: