rules for ghosts

I know I've seen them referenced before online, but I can't seem to find the rules for ghosts in any of my supplements.

Where are the rules published?


There are some rules in "The Broken Covenant of Calebais", which is choke-full of ghosts.

The Tremere section of True Lineages has a box called "Varieties of Ghost" (shouldn't that be Ghosts?) on pages 126-129.