Install bibus-doc-en by entering the following commands in the terminal:
sudo apt update sudo apt install bibus-doc-en
Bibus bibliographic database documentation
Bibus is a bibliographic database which has been developed with LibreOffice/ OpenOffice.org in mind and can directly insert citations and format the bibliographic index in an open LibreOffice/OpenOffice.org Writer document. . This package contains the Bibus documentation.