To cite clValid in publications use:

Guy Brock, Vasyl Pihur, Susmita Datta, Somnath Datta (2008). clValid: An R Package for Cluster Validation. Journal of Statistical Software, 25(4), 1-22. URL https://www.jstatsoft.org/v25/i04/

Corresponding BibTeX entry:

  @Article{,
    title = {{clValid}: An {R} Package for Cluster Validation},
    author = {Guy Brock and Vasyl Pihur and Susmita Datta and Somnath
      Datta},
    journal = {Journal of Statistical Software},
    year = {2008},
    volume = {25},
    number = {4},
    pages = {1--22},
    url = {https://www.jstatsoft.org/v25/i04/},
  }