David Kahle, Hadley Wickham, “ggmap: Spatial Visualization with ggplot2”, R Journal, 2013, 5(1), 144-161, https://doi.org/10.32614/RJ-2013-014
BibTeX
@article{RJ-2013-014,
author = {David Kahle and Hadley Wickham},
title = {ggmap: Spatial Visualization with ggplot2},
journal = {R Journal},
year = {2013},
volume = {5},
issue = {1},
pages = {144-161},
note = {https://journal.r-project.org/articles/RJ-2013-014/}
}