Gaya APA
Ritchie, D, D., Carola, R. (1979).
BIOLOGY SECOND EDITION .
United States of America:
ADDSON-WESLEY PUBLISHING COMPANY.
Gaya MLA
Ritchie, Donald, D.., Carola, Robert.
"BIOLOGY SECOND EDITION".
United States of America:
ADDSON-WESLEY PUBLISHING COMPANY,
1979.
Text.