To cite spBayes in publications use:

Finley AO, Banerjee S, Carlin BP (2007). “spBayes: An R Package for Univariate and Multivariate Hierarchical Point-Referenced Spatial Models.” Journal of Statistical Software, 19(4), 1–24. https://www.jstatsoft.org/article/view/v019i04.

Finley AO, Banerjee S, E.Gelfand A (2015). “spBayes for Large Univariate and Multivariate Point-Referenced Spatio-Temporal Data Models.” Journal of Statistical Software, 63(13), 1–28. https://www.jstatsoft.org/article/view/v063i13.

Corresponding BibTeX entries:

  @Article{,
    title = {{spBayes}: An {R} Package for Univariate and Multivariate
      Hierarchical Point-Referenced Spatial Models},
    author = {Andrew O. Finley and Sudipto Banerjee and Bradley P.
      Carlin},
    journal = {Journal of Statistical Software},
    year = {2007},
    volume = {19},
    number = {4},
    pages = {1--24},
    url = {https://www.jstatsoft.org/article/view/v019i04},
  }

  @Article{,
    title = {{spBayes} for Large Univariate and Multivariate
      Point-Referenced Spatio-Temporal Data Models},
    author = {Andrew O. Finley and Sudipto Banerjee and Alan
      E.Gelfand},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {63},
    number = {13},
    pages = {1--28},
    url = {https://www.jstatsoft.org/article/view/v063i13},
  }