#tertiary
- Soundmonitor lineage and wiki pages: tracker-history/soundmonitor.txt, C64-Wiki.de, de.wikipedia summaryThree small pages that fill in versions, dates and the German-language view of soundmonitor .
- Wikipedia (en): Chris Huelsbeck summaryTertiary, but with two things the wiki did not have: the citation trail (the 64'er contest was announced in issue 6/1986, p. 173) and a claim about who co-created TFMX.