Part 1
Citation: "Pexels Medical Professionals looking at a sample" by Pavel Danilyuk is licensed by CC BY 4.0
Part 2
First, I would direct the Davidson College Library webpage and then to the link titled "How to Cite" where they would be able to find the APA citation guide. Additionally, if that doesn't fit their needs I would direct them to Purdue OWL or the library catalog since if you can find the source there, you can find a prewritten citation.
Beaumont, M., Barratt, E. M., Gottelli, D., Kitchener, A. C., Daniels, M. J., Pritchard, J. K., & Bruford, M. W. (2001). Genetic diversity and introgression in the Scottish wildcat. Molecular