Gaya APA
Mifflin, Houghton. (1991).
Health .
U.S.A:
Houghton Mifflin Company.
Gaya Chicago
Mifflin, Houghton.
Health.
U.S.A:
Houghton Mifflin Company,
1991.
Text.
Gaya MLA
Mifflin, Houghton.
Health.
U.S.A:
Houghton Mifflin Company,
1991.
Text.
Gaya Turabian
Mifflin, Houghton.
Health.
U.S.A:
Houghton Mifflin Company,
1991.
Print.