Goetz CG, Poewe W, Rascol O, Sampaio C, Stebbins GT, Counsell C, Giladi N, Holloway RG, Moore CG, Wenning GK, Yahr MD, Seidl L (2004). "Movement Disorder Society Task Force Report on the Hoehn and Yahr Staging Scale: Status and Recommendations. The Movement Disorder Society Task Force on Rating Scales for Parkinson's Disease". Movement Disorders. 19 (9): 1020–1028. doi:10.1002/mds.20213. PMID15372591. S2CID42266048.
Zhao YJ, Wee HL, Chan YH, Seah SH, Au WL, Lau PN, Pica EC, Li SC, Luo N, Tan LC (2010). "Progression of Parkinson's disease as evaluated by Hoehn and Yahr stage transition times". Mov Disord. 25 (6): 710–716. doi:10.1002/mds.22875. PMID20213822. S2CID23544830.
Goetz CG, Poewe W, Rascol O, Sampaio C, Stebbins GT, Counsell C, Giladi N, Holloway RG, Moore CG, Wenning GK, Yahr MD, Seidl L (2004). "Movement Disorder Society Task Force Report on the Hoehn and Yahr Staging Scale: Status and Recommendations. The Movement Disorder Society Task Force on Rating Scales for Parkinson's Disease". Movement Disorders. 19 (9): 1020–1028. doi:10.1002/mds.20213. PMID15372591. S2CID42266048.
Zhao YJ, Wee HL, Chan YH, Seah SH, Au WL, Lau PN, Pica EC, Li SC, Luo N, Tan LC (2010). "Progression of Parkinson's disease as evaluated by Hoehn and Yahr stage transition times". Mov Disord. 25 (6): 710–716. doi:10.1002/mds.22875. PMID20213822. S2CID23544830.
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Goetz CG, Poewe W, Rascol O, Sampaio C, Stebbins GT, Counsell C, Giladi N, Holloway RG, Moore CG, Wenning GK, Yahr MD, Seidl L (2004). "Movement Disorder Society Task Force Report on the Hoehn and Yahr Staging Scale: Status and Recommendations. The Movement Disorder Society Task Force on Rating Scales for Parkinson's Disease". Movement Disorders. 19 (9): 1020–1028. doi:10.1002/mds.20213. PMID15372591. S2CID42266048.
Zhao YJ, Wee HL, Chan YH, Seah SH, Au WL, Lau PN, Pica EC, Li SC, Luo N, Tan LC (2010). "Progression of Parkinson's disease as evaluated by Hoehn and Yahr stage transition times". Mov Disord. 25 (6): 710–716. doi:10.1002/mds.22875. PMID20213822. S2CID23544830.