Παραπομπή APA
Elwood, M. J. (1998). Critical appraisal of epidemiological studies and clinical trials (2nd ed.). New york: Oxford University Press.
Παραπομπή Chicago StyleElwood, Mark J. Critical Appraisal of Epidemiological Studies and Clinical Trials. 2nd ed. New york: Oxford University Press, 1998.
Παραπομπή MLAElwood, Mark J. Critical Appraisal of Epidemiological Studies and Clinical Trials. 2nd ed. New york: Oxford University Press, 1998.
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