Παραπομπή APA

Edwards, P., Cooper, R., Roberts, I., & Frost, C. (2005). Meta-analysis of randomised trials of monetary incentives and response to mailed questionnaires. BMJ Group.

Παραπομπή Chicago Style

Edwards, P., R. Cooper, I. Roberts, και C. Frost. Meta-analysis of Randomised Trials of Monetary Incentives and Response to Mailed Questionnaires. BMJ Group, 2005.

Παραπομπή MLA

Edwards, P., R. Cooper, I. Roberts, και C. Frost. Meta-analysis of Randomised Trials of Monetary Incentives and Response to Mailed Questionnaires. BMJ Group, 2005.

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