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Wolf, Catherine G. (1973). "The perception of stop constants by children". Journal of Experimental Child Psychology. 16 (2): 318–331. doi:10.1016/0022-0965(73)90170-7. PMID4773589.
Wicks, P.; Massagli, M.P.; Wolf, C.; Heywood, J. (March 2009). "Measuring function in advanced ALS: validation of ALSFRS-EX extension items". European Journal of Neurology. 16 (1): 353–359. doi:10.1111/j.1468-1331.2008.02434.x. PMID19364363. S2CID27696665.
Wolf, Catherine G. (1973). "The perception of stop constants by children". Journal of Experimental Child Psychology. 16 (2): 318–331. doi:10.1016/0022-0965(73)90170-7. PMID4773589.
Wicks, P.; Massagli, M.P.; Wolf, C.; Heywood, J. (March 2009). "Measuring function in advanced ALS: validation of ALSFRS-EX extension items". European Journal of Neurology. 16 (1): 353–359. doi:10.1111/j.1468-1331.2008.02434.x. PMID19364363. S2CID27696665.