DUTTA, P. &. R. (2013). PASSAGE OF TIME - A TEXTBOOK FOR ICSE HISTORY & CIVICS CLASS 8. CAMBRIDGE UNIVERSITY PRESS.
Lua i Stíl Chicago (17ú heag.)DUTTA, PURNIMA & RAY. PASSAGE OF TIME - A TEXTBOOK FOR ICSE HISTORY & CIVICS CLASS 8. DELHI: CAMBRIDGE UNIVERSITY PRESS, 2013.
Lua MLA (9ú heag.)DUTTA, PURNIMA & RAY. PASSAGE OF TIME - A TEXTBOOK FOR ICSE HISTORY & CIVICS CLASS 8. CAMBRIDGE UNIVERSITY PRESS, 2013.
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