Gaya APA
Md, D, L, K. et al (2017).
Harrison Principles of Internal Medicine 19th Edition .
United States of America:
Mc Graw Hill.
Gaya MLA
Md, Dennis, L., Kasper,. et al.
"Harrison Principles of Internal Medicine 19th Edition".
United States of America:
Mc Graw Hill,
2017.
Text.