Hey Katherine! There are plenty more, those are just examples most text books utilize. Here are some additional resources:
https://www.pnas.org/content/113/47/E7438
https://www.open.edu/openlearn/science-maths-technology/science/biology/proteins/content-section-1.4.1
https://link.springer.com/content/pdf/10.1007%2F978-1-4614-6436-5_15-3.pdf
https://www.pnas.org/content/113/47/E7438
https://www.open.edu/openlearn/science-maths-technology/science/biology/proteins/content-section-1.4.1
https://link.springer.com/content/pdf/10.1007%2F978-1-4614-6436-5_15-3.pdf