If you use SkyPy for work or research presented in a publication (whether directly, or as a dependency to another package) we recommend and encourage the following acknowledgment:
This research made use of SkyPy, a Python package for forward modeling astronomical surveys (SkyPy Collaboration, 2020).
where (SkyPy Collaboration, 2020) is a citation to the software DOI for the specific version that you used. We also encourage you to cite the software DOI in the main text wherever appropriate. DOIs and BibTeX keys for each release can be found on Zenodo.