I'm building a public open source package that uses, as part of the library, a modified script from an already modified code originally under the GPL v3 license.
I want to allow optional academic citations in my package. E.g. in the readme of geobr the citation suggestion reads
Pereira, R.H.M.; Gonçalves, C.N.; et. all (2019) geobr: Loads Shapefiles of Official Spatial Data Sets of Brazil. GitHub repository - https://github.com/ipeaGIT/geobr.
How should I suggest the citation to be? Can I put only my name? Or should I put the previous authors, even without their consent? I've cited the previous authors in the modified script's docstring.