1. Ehn Knobblock I, Bender G. Hur mår doktoranden? [How does the doctoral student feel? Stockholm: Federation of Labour Unions; 2012. https://st.org/sites/default/files/attachment/hur_mar_doktoranden_juni_2012.pdf . Accessed 28 June 2019.
2. OECD Publications and Information Centre. Postgraduate education in the 1980s. Washington: Paris Organisation for Economic Co-operation and Development; 1987. https://eric.ed.gov/?id=ED286415 . Accessed 28 June 2019. ISBN: 92-64-12980-4.
3. Universitet och högskolor. Doktorander och examina på forskarnivå 2016. [Postgraduate students and degrees at third cycle 2017]. Statistiska Centralbyrån, Sverige [Statistics Sweden]. https://www.scb.se/contentassets/632f377ba0404d3e93641b7a48564db9/uf0204_2016a01_sm_uf21sm1701.pdf . Accessed 28 June 2019.
4. Manathunga C. Early warning signs in postgraduate research education: a different approach to ensuring timley completions. Teach High Educ. 2005;10:219–33.
5. Delamont S, Atkinson P, Parry O. Critical mass and doctoral research: reflections on the Harris report. Stud High Educ. 1997;22:319–31.