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

Tajbakhsh, S(2019). β-galactosidase detection in embryos and tissues using X-Gal. Bio-protocol Preprint. bio-protocol.org/prep160.
Comai, G., Heude, E., Mella, S., Paisant, S., Pala, F., Gallardo, M., Langa, F., Kardon, G., Gopalakrishnan, S. and Tajbakhsh, S.(2019). A distinct cardiopharyngeal mesoderm genetic hierarchy establishes antero-posterior patterning of esophagus striated muscle. eLIFE. DOI: 10.7554/eLife.47460