APA

Fletcher K. E., French C. T., Irwin R. S., Corapi K. M. & Norman G. R. (20101116). A prospective global measure, the Punum Ladder, provides more valid assessments of quality of life than a retrospective transition measure. : Journal of clinical epidemiology.

Chicago

Fletcher Kenneth E, French Cynthia T, Irwin Richard S, Corapi Kristin M and Norman Geoffrey R. 20101116. A prospective global measure, the Punum Ladder, provides more valid assessments of quality of life than a retrospective transition measure. : Journal of clinical epidemiology.

Harvard

Fletcher K. E., French C. T., Irwin R. S., Corapi K. M. and Norman G. R. (20101116). A prospective global measure, the Punum Ladder, provides more valid assessments of quality of life than a retrospective transition measure. : Journal of clinical epidemiology.

MLA

Fletcher Kenneth E, French Cynthia T, Irwin Richard S, Corapi Kristin M and Norman Geoffrey R. A prospective global measure, the Punum Ladder, provides more valid assessments of quality of life than a retrospective transition measure. : Journal of clinical epidemiology. 20101116.