Readers should cite both the Bio-protocol preprint and the original research article where this protocol was used:

Collias, D, Leenay, R, Slotkowski, R, Zuo, Z, Liu, J and Beisel, C(2021). Binding energy calculations by molecular mechanics–generalized Born surface area. Bio-protocol Preprint. bio-protocol.org/prep1050.
Collias, D., Leenay, R. T., Slotkowski, R. A., Zuo, Z., Collins, S. P., McGirr, B. A., Liu, J. and Beisel, C. L.(2020). A positive growth-based PAM screen identifies noncanonical motifs recognized by the S. pyogenes Cas9 . Science Advances 6(29). DOI: 10.1126/sciadv.abb4054