To cite opentripplanner package in publications use: Morgan et al., (2019). OpenTripPlanner for R. Journal of Open Source Software, 4(44), 1926, https://doi.org/10.21105/joss.01926 A BibTeX entry for LaTeX users is @Article{, title = {OpenTripPlanner for R}, author = {{Malcolm Morgan} and {Marcus Young} and {Robin Lovelace} and {Layik Hama}}, journal = {Journal of Open Source Software}, year = {2019}, volume = {4}, number = {44}, pages = {1926}, doi = {10.21105/joss.01926}, }