Gaya APA

LONGO,, D, L. et al (2012). (E) Harrison's principle of internal medicine self asessment and board review (ed 18). : by The McGraw-Hill Companies.

Gaya MLA

LONGO,, DAN, L.. et al. "(E) Harrison's principle of internal medicine self asessment and board review". ed 18 : by The McGraw-Hill Companies, 2012. Text.