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

Li, W, Mannix, R, Karp, J and Joshi, N(2021). Preparation and characterization of NPs coated with different surface chemistries. Bio-protocol Preprint. bio-protocol.org/prep1191.
Li, W., Qiu, J., Li, X., Aday, S., Zhang, J., Conley, G., Xu, J., Joseph, J., Lan, H., Langer, R., Mannix, R., Karp, J. M. and Joshi, N.(2020). BBB pathophysiology–independent delivery of siRNA in traumatic brain injury. Science Advances 7(1). DOI: 10.1126/sciadv.abd6889