GUPTA. K. K. (2012). FRANK MODERN CERTIFICATE CHEMISTRY FOR MIDDLE SCHOOL CLASS- 6 ( 2013- 14 ). FRANK BROS.
Lua i Stíl Chicago (17ú heag.)GUPTA. K. K. FRANK MODERN CERTIFICATE CHEMISTRY FOR MIDDLE SCHOOL CLASS- 6 ( 2013- 14 ). FRANK BROS, 2012.
Lua MLA (9ú heag.)GUPTA. K. K. FRANK MODERN CERTIFICATE CHEMISTRY FOR MIDDLE SCHOOL CLASS- 6 ( 2013- 14 ). FRANK BROS, 2012.
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