How to create a simple logout link?

[simonle]

How do I create a simple sign out link for my users?

I am trying with this code, but it's not working:

<a href='{url="app=core&module=system&controller=login&do=logout" csrf="true" seoTemplate="logout"}' class='ipsButton ipsButton_verySmall ipsButton_light' data-ipsTooltip data-ipsMenu title='message'>Logout</a>

Can anyone help me or point in the right direction? Thanks!