Finland
Rantala L. Voice at work. Female teachers´use and loading of voice. University of Oulu, 2000. Á finnsku en abstrakt og greinar sem fylgja á ensku.
Pekkarinen E. Effects of noise and reverberation on speech discrimination. Doctorl dissertation. Turku: Turku University, 1988.
Vintturi J. Studies on voice production with a special emphasis on vocal loading gender, some exposure factors and intensity regulation. Doctoral dissertation. Helsinki: Helsinki University, 2001.
Sihvo M. Voice in test. Doctoral dissertation. Acta Universitatis Tamperensis 541. Tampere: University of Tampere, 1997.
Laukkanen A-M. On speaking voice exercises. Doctoral dissertation, Tampere: Tampere University, Finland, 1995.
Lehto L. Occupational voice-studying voice production and preventing voice problems with special emphasis on call-centre employers. Doctorial dissertation. Helsinki University of technology, 2007
Vilkman E. Studies on human voice production. Tampere, University of Tampere, 1987.
Svíþjóð
Hammarberg B. Perceptual and acoustic analysis of dysphonia. Doctoral Dissertation. Karolinska Institutet, Stockholm, 1986.
Kitzing P. Glottographic frequency analysis (in Swedish). Doctoral dissertation Lund: Lund University, 1979.
Ohlson A-C. Voice and work environment: Towards an ecology of vocal behaviour. Doctoral dissertation. Gothenburg: University of Gothenburg, 1988.
Ísland
Valdís Ingibjörg Jónsdóttir. The effects of professional demands and environmental influences on teachers’ voices in North East Iceland. A thesis (M.Phil). Glasgow: Department of Speech and Language Therapy at Faculty of Education. University of Strathclyde, 1997. The effects of professional demands and environmental influences on teachers´voices in North East ICeland
Valdís I. Jónsdóttir. A Voice. An Occuaptional Tool. Doctorial dissertation. Tampere University, Finland 2003.The voice. An occupational tool
Noregur
Bele, IV. Voice quality. A Perceptual and Acoustic Analysis of Voice Quality of a Group of Male Actors [In Norwegian: Stemmekvalitet. En perseptuell og akustisk analyse av stemmekvalitet hos en gruppe mannlige skuespillere] Master thesis. (Hovedfag-thesis), Faculty of Education, University of Oslo, 1997. Oslo: University of Oslo.
Bele, IV. Professional Speaking Voice. A Perceptual and Acoustic Study of Male Actors’ and Teachers’ Voices. Doctoral dissertation. Faculty of Education, University of Oslo, 2002. Oslo: University of Oslo.