APA
HILLIS D. M., 1.HELLER C. H. 2. P. M. V. 3. S. D., . (2012). PRINCIPLES OF LIFE. UNITED STATES: PLANET FRIENDLY PUBLISHING.
Chicago
HILLIS DAVID M, 1.HELLER CRAIG H 2 PRICE MARY V 3 SADAVA DAVID, . 2012. PRINCIPLES OF LIFE. UNITED STATES: PLANET FRIENDLY PUBLISHING.
Harvard
HILLIS D. M., 1.HELLER C. H. 2. P. M. V. 3. S. D., . (2012). PRINCIPLES OF LIFE. UNITED STATES: PLANET FRIENDLY PUBLISHING.
MLA
HILLIS DAVID M, 1.HELLER CRAIG H 2 PRICE MARY V 3 SADAVA DAVID, . PRINCIPLES OF LIFE. UNITED STATES: PLANET FRIENDLY PUBLISHING. 2012.