Le, Tao. First aid for the USMLE step 2 CK / Tao Le, Vikas Bhushan, Nathan William Skelley. - 8th ed. - New York : McGraw-Hill, 2012. - xv, 574 p. : ill. ; 28 cm. ISBN: 9780071761376 RM138.47 Subjects--Topical Terms: Clinical medicine.Medicine.Licensure, Medical. Subjects--Geographic Terms: United States. Index Terms--Genre/Form: Examination Questions.