Part 1: 

Ivan Radic, Protester with a sign that reads "There is no Planet B" at a rally against climate change, used under CC BY 2.0 license (https://creativecommons.org/licenses/by/2.0/), image from https://flickr.com/photos/26344495@N05/51059103306/in/photolist-2kMVfxm-2c2Lvk8-2kMgku2-TgxjaC-2ndURML-2NpB1T-2c2LvJ4-NgDcJB-2iVkj1b-8m53K1-2bXu6K9-nFmWD9-2bXu6Sd-NgDcXx-4m6AtP-2nXtsfX-AG12mj-2ncPCRK-pDpgzi-DG4qQa-2neqR9g-8Zs86k-psurVi-GbQGP4-2hRUceR-6E1bXn-92QnBj-nmdjRn-2duuyxU-2ndHDSr-HKhFJh-2neqXF1-6ftwD1-2ndK2xu-7a4ax4-2ng6hN3-NgDbu2-2neoo3w-2nXtrmT-GDqpFn-2kMVfi8-2ndG4Re-U4vRDJ-2Nrv3K-2hRMJtp-2nepxWZ-6QtpAN-2hrugiJ-24LNM6R-2NqP84

Part 2:

I would direct the patron to the library website. Then to the homepage where it says "Learn How to Cite." From there I would suggest they look through the APA Citation Guide.

Beaumont, M., Barratt, E.M., Gottelli, D., Kitchener, A. C., Daniels, M. J., Pritchard, J. K., and Bruford, M. W. (2008) Genetic Diversity and Introgression in the Scottish Wildcat, Molecular Ecology, 10(2), 319-336, https://doi.org/10.1046/j.1365-294X.2001.01196.x.