HARRISON. E. R. (2012). FRANK MODERN CERTIFICATE BIOLOGY FOR MIDDLE SCHOOL CLASS- 8 ( 2013- 14 ). FRANK BROS.
Cita Chicago (17th ed.)HARRISON. E. R. FRANK MODERN CERTIFICATE BIOLOGY FOR MIDDLE SCHOOL CLASS- 8 ( 2013- 14 ). FRANK BROS, 2012.
Cita MLA (9th ed.)HARRISON. E. R. FRANK MODERN CERTIFICATE BIOLOGY FOR MIDDLE SCHOOL CLASS- 8 ( 2013- 14 ). FRANK BROS, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.