How to download sources for sudo

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http://askubuntu.com – I would like to get the sources for sudo and I found out that I am suppose to use sudo apt-get source sudo, but then it says it does not find any sources (even though i have told the Software Manager that it can download sources from the Internet) or that my sources.list is empty. Now, to add a new source repository I need the APT line format. But I only have a link for the package (there is this page containing many links http://www.sudo.ws/sudo/download.html#source). How do I make an APT line out of a link? I know the APT format, but how do I find out what to put in front and after the lin (HowTos)