https://socialstudies.sushilsilwal.com.np/grade-xii/%e0%a4%8f%e0%a4%95%e0%a4%be%e0%a4%87-%e0%a5%ac-%e0%a4%a8%e0%a5%87%e0%a4%aa%e0%a4%be%e0%a4%b2%e0%a4%95%e0%a5%8b-%e0%a4%87%e0%a4%a4%e0%a4%bf%e0%a4%b9%e0%a4%be%e0%a4%b8/%e0%a4%aa%e0%a4%be%e0%a4%a0-%e0%a5%ab-%e0%a4%ae%e0%a4%a7%e0%a5%8d%e0%a4%af%e0%a4%95%e0%a4%be%e0%a4%b2%e0%a4%ae%e0%a4%be-%e0%a4%b8%e0%a4%b8%e0%a4%be%e0%a4%a8%e0%a4%be-%e0%a4%b0%e0%a4%be%e0%a4%9c/