To cite BP4RNAseq in publications use:

  Shanwen Sun, Lei Xu, Quan Zou (2020). BP4RNAseq: a babysitter package
  for retrospective and newly generated RNA-seq data analyses using
  both alignment-based and alignment-free quantification methods R
  package version 0.2.2 URL https://github.com/sunshanwen/BP4RNAseq

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {BP4RNAseq: a babysitter package for retrospective and newly generated RNA-seq data analyses using both alignment-based and alignment-free quantification methods},
    author = {Shanwen Sun and Lei Xu and Quan Zou},
    year = {2020},
    note = {R package version 0.2.2},
    url = {https://github.com/sunshanwen/BP4RNAseq},
  }