APA Style

Hughes, H, K., Kahl, L, K. (2018). The Johns Hopkins Hospital: The Harriet Lane Handbook (twenty-first edition) (twenty-first). United States of America: Elsevier.

MLA Style

Hughes, Helen, K.., Kahl, Lauren, K.. "The Johns Hopkins Hospital: The Harriet Lane Handbook (twenty-first edition)". twenty-first United States of America: Elsevier, 2018. Textbook.