Most articles about Kuula are written in Finnish but here are some in English:

• Elmgren T: "T.K, a Finnish composer of genius" Hki 1952
• Elmgren T: "T.K, themes of a life’s work" leaflet around 1988 in MILS CD boxes
• Henshall Dalwyn: "T.K." 1996 (chapter 4 in a collective book, the title of which is for the moment unknown)
• Hillilä R. E: "The solo songs of T.K." diss. Boston Univ. 1964
• Roiha Eino: "The music of T.K" Hki 1952
• Salmenhaara Erkki: "Finland's tragic romantic" Finnish Music Quarterly 2/1987