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Power and stability in Nigeria : the politics of decolonization
Bretton, Henry L., (1962)
Opinionsbildningen vid folkomröstningen 1957
Särlvik, Bo, (1959)
Surveys, polls, and samples : practial procedures
Parten, Mildred, (1950)
Statistical methods for rates and proportions
Fleiss, Joseph L., (1981)
Fleiss, Joseph L., (2003)