GUPTA.K.K. (2013). FRANK MODERN CERTIFICATE CHEMISTRY FOR MIDDLE SCHOOL WORKBOOK CLASS-VI. FRANK BROS & CO.
Chicago-viite (17. p.)GUPTA.K.K. FRANK MODERN CERTIFICATE CHEMISTRY FOR MIDDLE SCHOOL WORKBOOK CLASS-VI. FRANK BROS & CO, 2013.
MLA-viite (9. p.)GUPTA.K.K. FRANK MODERN CERTIFICATE CHEMISTRY FOR MIDDLE SCHOOL WORKBOOK CLASS-VI. FRANK BROS & CO, 2013.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.