To cite "unmixing" in a scholarly article, please use the DOI 10.5281/zenodo.3585979, preferably as part of a full citation:
Endsley, K. A. 2019. "The unmixing library: Interactive tools for spectral mixture analysis of multispectral raster data in Python v0.2.4.dev." Zenodo. https://zenodo.org/record/3585979