Gaya APA
Schwartzkopf, S. et al (1981).
Independent Investigasi in Introductory Biology (Ed. 2).
Minnesota:
Burgess Publishing ompany.
Gaya MLA
Schwartzkopf, Steven. et al.
"Independent Investigasi in Introductory Biology".
Ed. 2
Minnesota:
Burgess Publishing ompany,
1981.
Text.