Tones, B. K., & Berg, J. M. Effectiveness and efficiency in health education: A review of theory and practice. Scottish Health Education Unit.
Παραπομπή σε μορφή Chicago (17η εκδ.)Tones, B. K., και J. M. Berg. Effectiveness and Efficiency in Health Education: A Review of Theory and Practice. Scotland: Scottish Health Education Unit.
Παραπομπή σε μορφή MLA (8th εκδ.)Tones, B. K., και J. M. Berg. Effectiveness and Efficiency in Health Education: A Review of Theory and Practice. Scottish Health Education Unit.
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