World Health Organization. (1993). Health Research Methodology: A guide for Training in Research Methods. OXFORD UNIVERSITY PRESS.
Citace podle Chicago (17th ed.)World Health Organization. Health Research Methodology: A Guide for Training in Research Methods. New Delhi: OXFORD UNIVERSITY PRESS, 1993.
Citace podle MLA (9th ed.)World Health Organization. Health Research Methodology: A Guide for Training in Research Methods. OXFORD UNIVERSITY PRESS, 1993.
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