To cite both the mctest related paper and the mctest package:

Muhammad I, Muhammad A (2026). mctest: Multicollinearity Diagnostic Measures. R package version 1.3.2, https://CRAN.R-project.org/package=mctest.

Muhammad I, Muhammad A, Saima A (2016). “mctest: An R Package for Deteection of Collinearity among Regressors.” The R Journal, 8(2), 495-505. https://journal.r-project.org/articles/RJ-2016-062/index.html.

Muhammad I, Muhammad A, Saima A, Ahmed M (2019). “Some New Diagnostics of Multicollinearity in Linear Regression Model.” Sains Malaysiana, 48(9), 2051-2060. http://dx.doi.org/10.17576/jsm-2019-4809-26.

Corresponding BibTeX entries:

  @Manual{,
    title = {mctest: Multicollinearity Diagnostic Measures},
    author = {Imdad Ullah Muhammad and Aslam Muhammad},
    year = {2026},
    note = {R package version 1.3.2},
    url = {https://CRAN.R-project.org/package=mctest},
  }

  @Article{,
    title = {mctest: An R Package for Deteection of Collinearity among
      Regressors},
    author = {Imdadullah Muhammad and Aslam Muhammad and Altaf Saima},
    journal = {The R Journal},
    year = {2016},
    volume = {8(2)},
    pages = {495-505},
    url =
      {https://journal.r-project.org/articles/RJ-2016-062/index.html},
  }

  @Article{,
    title = {Some New Diagnostics of Multicollinearity in Linear
      Regression Model},
    author = {Imdad Ullah Muhammad and Aslam Muhammad and Altaf Saima
      and Munir Ahmed},
    journal = {Sains Malaysiana},
    year = {2019},
    volume = {48(9)},
    pages = {2051-2060},
    url = {http://dx.doi.org/10.17576/jsm-2019-4809-26},
  }