Zaritsky, D., McCabe, K., Aravena, M., Athanassoula, E., Bosma, A., Comerón, S., …Sheth, K. (2016). Globular Cluster Populations: Results Including S$^4$G Late-type Galaxies. Astrophysical Journal, 818(1), https://doi.org/10.3847/0004-637x/818/1/99