Jenkinson, C., Heffernan, C., Doll, H., Fitzpatrick, R., & Society, B. G. (2006). The Parkinson's Disease Questionnaire (PDQ-39): Evidence for a method of imputing missing data. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Jenkinson, C., C. Heffernan, H. Doll, R. Fitzpatrick, agus British Geriatrics Society. The Parkinson's Disease Questionnaire (PDQ-39): Evidence for a Method of Imputing Missing Data. Oxford University Press, 2006.
Lua MLA (9ú heag.)Jenkinson, C., et al. The Parkinson's Disease Questionnaire (PDQ-39): Evidence for a Method of Imputing Missing Data. Oxford University Press, 2006.
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