Michael Lewis-Beck. The SAGE Encyclopedia of Social Science Research Methods. SAGE.
Citazione stile Chigago Style (17a edizione)Michael Lewis-Beck. The SAGE Encyclopedia of Social Science Research Methods. SAGE.
Citatione MLA (8a ed.)Michael Lewis-Beck. The SAGE Encyclopedia of Social Science Research Methods. SAGE.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.