Changes
Fixed function call.
function internallinkid(frame, args)
local sep = args.separator or " "
args.suffix = args.suffix or ""
local t0 = onlyinprint(frame, args.label .. sep .. args.id)
local t1 = hideinprint(frame, "[[" .. args.link .. "|" .. args.label .. "]]" .. sep .. "[[" .. args.prefix .. "{{urlencode:" args.id .. args.id suffix .. "}}|" .. nowiki(frame, args.id) .. "]]")
return t0 .. t1
end
if ( ID ~= nil ) then ID = " " .. ID else ID = "" end
if ( ISBN ~= nil ) then ISBN = " " .. internallinkid(frame, {label="ISBN",link="International Standard Book Number",prefix="Special:BookSources/",id=ISBN}) else ISBN = "" end
if ( ISSN ~= nil ) then ISSN = " " .. externalinkidexternallinkid(frame, {label="ISSN",link="International Standard Serial Number",prefix="//www.worldcat.org/issn/",id=ISSN}) else ISSN = "" end
if ( JFM ~= nil ) then JFM = " " .. externallinkid(frame, {label="JFM",link="Jahrbuch über die Fortschritte der Mathematik",prefix="http://www.zentralblatt-math.org/zmath/en/search/?format=complete&q=an:",id=JFM}) else JFM = "" end
if ( JSTOR ~= nil ) then JSTOR = " " .. externallinkid(frame, {label="JSTOR",link="JSTOR",prefix="http://www.jstor.org/stable/",id=JSTOR}) else JSTOR = "" end