To cite bsamGP in publications use:

Jo S, Choi T, Park B, Lenk P (2019). “bsamGP: An R Package for Bayesian Spectral Analysis Models Using Gaussian Process Priors.” Journal of Statistical Software, 90(10), 1–41. doi:10.18637/jss.v090.i10.

Corresponding BibTeX entry:

    title = {{bsamGP}: An {R} Package for {B}ayesian Spectral Analysis
      Models Using {G}aussian Process Priors},
    author = {Seongil Jo and Taeryon Choi and Beomjo Park and Peter
    journal = {Journal of Statistical Software},
    year = {2019},
    volume = {90},
    number = {10},
    pages = {1--41},
    doi = {10.18637/jss.v090.i10},