Παραπομπή σε μορφή APA (7η εκδ.)

(2018). Preface to the third edition - Field Trials of Health Interventions - NCBI Bookshelf.pdf. Oxford University Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Preface to the Third Edition - Field Trials of Health Interventions - NCBI Bookshelf.pdf. Oxford University Press, 2018.

Παραπομπή σε μορφή MLA (8th εκδ.)

Preface to the Third Edition - Field Trials of Health Interventions - NCBI Bookshelf.pdf. Oxford University Press, 2018.