Tài liệu tham khảo

WikiPedia: A._P._J._Abdul_Kalam http://www.abdulkalam.com/ http://www.abdulkalam.com http://news.biharprabha.com/2014/06/dr-abdul-kalam... http://www.flipkart.com/turning-points-9350293471/... http://books.google.com/?id=DXQ8&printsec=frontcov... http://books.google.com/?id=Ee3PR5HFBCAC http://books.google.com/?id=IjZA-bQde1wC&pg=RA1-PA... http://books.google.com/?id=Kpd9lLY_0-IC&dq=abdul+... http://books.google.com/?id=kypuAAAAMAAJ&q=ignited... http://books.google.com/?id=pCN7NwAACAAJ&dq=vision...