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

Kang, J and Darst, S(2020). Glutaraldehyde Cross-linked Nun/TEC Preparation for CryoEM. Bio-protocol Preprint. bio-protocol.org/prep373.
Kang, J. Y., Olinares, P. D. B., Chen, J., Campbell, E. A., Mustaev, A., Chait, B. T., Gottesman, M. E. and Darst, S. A.(2017). Structural basis of transcription arrest by coliphage HK022 Nun in an Escherichia coli RNA polymerase elongation complex. eLIFE. DOI: 10.7554/eLife.25478