Gaya APA
MCPHERSON, S, S. (2002).
JONAS SALK CONQUERING POLIO .
United States of America:
Lerner Publications Company.
Gaya MLA
MCPHERSON, Stephanie, Sammartino.
"JONAS SALK CONQUERING POLIO".
United States of America:
Lerner Publications Company,
2002.
Text.