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APA Citation
Philbrook, L. E., Vaughn, B. E., Lu, T., Krzysik, L., & El-Sheikh, M. (n.d.). stability and change in daytime and nighttime sleep in children attending daycare. International journal of behavioral development, 43, 166–172. http://access.bl.uk/ark:/81055/vdc_100079529246.0x00000c