To cite package ‘ipkg’ in publications use:

  Chu X (2023). _ipkg: Install R Packages or Download File from GitHub
  via the Proxy Site_. R package version 1.1.1,
  <https://gitlab.com/chuxinyuan/ipkg>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ipkg: Install R Packages or Download File from GitHub via the Proxy
Site},
    author = {Xinyuan Chu},
    year = {2023},
    note = {R package version 1.1.1},
    url = {https://gitlab.com/chuxinyuan/ipkg},
  }