To cite shp2graph in publications use:
Binbin Lu, Huabo Sun, Miaozhong Xu, Paul Harris, Martin Charlton (2018). “Shp2graph: Tools to Convert a Spatial Network into an Igraph Graph in R.” ISPRS International Journal of Geo-Information, 7(8), 293. doi:10.3390/ijgi7080293.
Corresponding BibTeX entry:
@Article{, title = {{Shp2graph}: Tools to Convert a Spatial Network into an Igraph Graph in R}, author = {{Binbin Lu} and {Huabo Sun} and {Miaozhong Xu} and {Paul Harris} and {Martin Charlton}}, journal = {ISPRS International Journal of Geo-Information}, year = {2018}, volume = {7}, number = {8}, pages = {293}, doi = {10.3390/ijgi7080293}, }