GOSAIN , R. 101 INVENTIONS & DISCOVERIES. GOODWILL PUBLISHING HOUSE.
Chicago-čujuhus (17. p.)GOSAIN , ROOPA. 101 INVENTIONS & DISCOVERIES. NEW DELHI: GOODWILL PUBLISHING HOUSE.
MLA-čujuhus (9. p.)GOSAIN , ROOPA. 101 INVENTIONS & DISCOVERIES. GOODWILL PUBLISHING HOUSE.
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