@inbook{1198804584,
author={Emily J. Ashjian},
editor={Matthias, Kathryn R. and Katz, Michael D.},
title={Vitamin B12 Deficiency Anemia},
booktitle={Pharmacotherapy Principles and Practice Study Guide, 6e},
publisher={McGraw Hill},
address={New York, NY},
year={2023},
url={ppp.mhmedical.com/content.aspx?aid=1198804584}
}