1. Summing up. The science of reviewing research;Light,1984
2. Meta-analysis, Quantitative methods for research synthesis;Wolf,1986
3. Meta-analysis of social research;Glass,1981
4. Combining results from independent investigations. Meta-analysis in medical research;Halvorsen,1986
5. Methods used to evaluate growth modification in Class II malocclusion;Tulloch;Am J Orthod Dentofac Orthop,1990