Human Development Report 1990(PDF). hdr.undp.org. United Nations Development Programme. 1 May 1990. pp. iii, iv, 5, 9, 12. ISBN0-19-506481-X. Archived(PDF) from the original on 7 February 2019. Retrieved 15 December 2020.
Human Development Report 1990(PDF). hdr.undp.org. United Nations Development Programme. 1 May 1990. pp. iii, iv, 5, 9, 12. ISBN0-19-506481-X. Archived(PDF) from the original on 7 February 2019. Retrieved 15 December 2020.