APA Style

S.Firestein, G. (2021). Firesdein and Kelleys Textbook of Rheumatology (Vol-I) (Eleventh Edition). New York: ELSEVIER.

MLA Style

S.Firestein, Gary's. "Firesdein and Kelleys Textbook of Rheumatology (Vol-I)". Eleventh Edition New York: ELSEVIER, 2021. Text.