To cite package 'HH' in publications use:

Heiberger RM (2019).

HH: Statistical Analysis and Data Display: Heiberger and Holland.. R package version 3.1-39, https://CRAN.R-project.org/package=HH.

To cite the HH book (second edition) in publications use:

Heiberger RM, Holland B (2015).

Statistical Analysis and Data Display: An Intermediate Course with Examples in R, Second edition. Springer-Verlag, New York. http://www.springer.com/us/book/9781493921218.

To cite the HH book (first edition) in publications use:

Heiberger RM, Holland B (2004).

Statistical Analysis and Data Display: An Intermediate Course with Examples in S-Plus, R, and SAS, First edition. Springer-Verlag, New York. http://www.springer.com/us/book/9781441923202.

To cite likert from HH in publications use:

Heiberger RM, Robbins NB (2014). “Design of Diverging Stacked Bar Charts for Likert Scales and Other Applications.”

Journal of Statistical Software,57(5), 1–32. http://www.jstatsoft.org/v57/i05/.

Corresponding BibTeX entries:

@Manual{, title = {HH: Statistical Analysis and Data Display: Heiberger and Holland.}, author = {Richard M. Heiberger}, year = {2019}, note = {R package version 3.1-39}, url = {https://CRAN.R-project.org/package=HH}, }

@Book{, title = {Statistical Analysis and Data Display: An Intermediate Course with Examples in {R}}, author = {Richard M. Heiberger and Burt Holland}, year = {2015}, publisher = {Springer-Verlag, New York}, edition = {Second}, url = {http://www.springer.com/us/book/9781493921218}, }

@Book{, title = {Statistical Analysis and Data Display: An Intermediate Course with Examples in {S-Plus}, {R}, and {SAS}}, author = {Richard M. Heiberger and Burt Holland}, year = {2004}, publisher = {Springer-Verlag, New York}, edition = {First}, url = {http://www.springer.com/us/book/9781441923202}, }

@Article{, title = {Design of Diverging Stacked Bar Charts for Likert Scales and Other Applications}, author = {Richard M. Heiberger and Naomi B. Robbins}, journal = {Journal of Statistical Software}, year = {2014}, volume = {57}, number = {5}, pages = {1--32}, url = {http://www.jstatsoft.org/v57/i05/}, }