HARRISON. E. R. (2014). FRANK MODERN CERTIFICATE BIOLOGY FOR MIDDLE SCHOOL CLASS- VIII ( TEACHER'S MANUAL ). FRANK BROS & CO.
Chicago-viite (17. p.)HARRISON. E. R. FRANK MODERN CERTIFICATE BIOLOGY FOR MIDDLE SCHOOL CLASS- VIII ( TEACHER'S MANUAL ). FRANK BROS & CO, 2014.
MLA-viite (9. p.)HARRISON. E. R. FRANK MODERN CERTIFICATE BIOLOGY FOR MIDDLE SCHOOL CLASS- VIII ( TEACHER'S MANUAL ). FRANK BROS & CO, 2014.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.