Cita APA (7a ed.)
Freedman, D., Pisani, R., & Purves, R. (1974). Statistics. W.W. Norton & Company.
Cita Chicago Style (17a ed.)
Freedman, David, Robert Pisani, y Roger Purves. Statistics. New York: W.W. Norton & Company, 1974.
Cita MLA (9a ed.)
Freedman, David, et al. Statistics. W.W. Norton & Company, 1974.
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