Tài liệu tham khảo WikiPedia: Luna_8 http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.d... http://www.zarya.info/Diaries/Luna/Luna.php //tools.wmflabs.org/geohack/geohack.php?language=v... https://www.webcitation.org/6Z2rNfVYa?url=http://n...
