Gaya APA
Pherson, S, S. (2002).
A Lerner biography : Jonas Salk Conquering Polio .
Minneapolis:
Lerner Publicatin Company.
Gaya MLA
Pherson, Stephanie, Sammartino.
"A Lerner biography : Jonas Salk Conquering Polio".
Minneapolis:
Lerner Publicatin Company,
2002.
Text.