Gaya APA
Ritchie, D, D., Carola, R.
(1983).
Biology
(
2nd ed.)
.
Massachusetts:
Addison-Wesley Publishing Company.
Gaya MLA
Ritchie, Donald, D.., Carola, Robert.
"Biology".
2nd ed.
Massachusetts:
Addison-Wesley Publishing Company,
1983.
Text.