This is a list of what wikis are linked to, and what part of the page you should put as your interwiki link. Look at dokuwiki help for info on [[doku>interwiki]] syntax. The highlighted part is what you put after the right triangle bracket.

^ Wikipedia                     || wp      | en.wikipedia.org/wiki/<wrap hi>Page</wrap>                                   | [[wp>interwiki]]           |
^ Dokuwiki                      || doku    | dokuwiki.org/<wrap hi>ID</wrap>                                              | [[doku>interwiki]]         |
^ 4chan                         || 4chan   | 4chan.org/<wrap hi>board</wrap>                                              | [[4chan>cm]]               |
^ Hypertext d20 SRD             || d20     | d20srd.org/srd/<wrap hi>section/name</wrap>.htm/<wrap hi>#subsection</wrap>  | [[d20>planes]]             |
^ D&D Wiki                      || dandd   | dandwiki.com/wiki/<wrap hi>Page</wrap>                                       | [[dandd>SRD:Plane_Shift]]  |
^ Dungeons and Dragons Wiki     || dnd     | dnd-wiki.org/wiki/<wrap hi>Page</wrap>                                       | [[dnd>SRD:About_Planes]]   |
^ Realms Help                   || faerun  | realmshelps.net/faerun/<wrap hi>Page</wrap>.shtml                            | [[faerun>planes/index]]    |
^ Li Po's Planescape            || plane   | pathguy.com/<wrap hi>plane</wrap>.htm<wrap hi>#subsection</wrap>             | [[plane>planes]]           |
^ TV Tropes                     || trope   | tvtropes.org/pmwiki/pmwiki.php/Main/<wrap hi>Trope</wrap>                    | [[trope>TheMultiverse]]    |
^ 1d4chan                       || 1d4     | 1d4chan.org/wiki/<wrap hi>Planescape</wrap>                                  | [[1d4>planescape]]         |
^ Forgotten Realms Wiki || realms | forgottenrealms.wikia.com/wiki/<wrap hi>Page</wrap> | [[realms>faerun]] |