An important aspect of knowledge work is to interconnect your zettel as well as provide links to (external) material.

There are several kinds of references that are allowed in Zettelmarkup:

* [Links to other zettel or to (external) material](00001007040310)
* [Embedded zettel or (external) material](00001007040320) (“inline transclusion”)
* [Reference via a footnote](00001007040330)
* [Reference via a citation key](00001007040340)
* Put a [mark](00001007040350) within your zettel that you can reference later with a link.