See also: [http://psycnet.apa.org/index.cfm?fa=buy.optionToBuy&id=1979-31736-001 Abstract - Comparative effectiveness of paraprofessional and professional helpers] and [http://www.ncbi.nlm.nih.gov/pubmed/6399757 PubMed citation - Comparative effectiveness of paraprofessional and professional helpers] | See also: [http://psycnet.apa.org/index.cfm?fa=buy.optionToBuy&id=1979-31736-001 Abstract - Comparative effectiveness of paraprofessional and professional helpers] and [http://www.ncbi.nlm.nih.gov/pubmed/6399757 PubMed citation - Comparative effectiveness of paraprofessional and professional helpers] |