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