APA   Click to copy
Miller, J., Martínez, M., & Margolis, K. (2021). Reply. Gastroenterology.

Chicago/Turabian   Click to copy
Miller, Jonathan, Mercedes Martínez, and K. Margolis. “Reply.” Gastroenterology (2021).

MLA   Click to copy
Miller, Jonathan, et al. “Reply.” Gastroenterology, 2021.

@article{jonathan2021a,
  title = {Reply},
  year = {2021},
  journal = {Gastroenterology},
  author = {Miller, Jonathan and Martínez, Mercedes and Margolis, K.}
}