Gaya APA
Usmle Step 2020. (2021).
New York:
Mc Graw-Hill Book Company.
Gaya Chicago
Usmle Step 2020.
.
New York:
Mc Graw-Hill Book Company,
2021.
Text.
Gaya MLA
Usmle Step 2020.
.
New York:
Mc Graw-Hill Book Company,
2021.
Text.
Gaya Turabian
Usmle Step 2020.
New York:
Mc Graw-Hill Book Company,
2021.
Print.