Eckhardt, K. W., & Ermann,M.David. (1977). Social research methods: Perspective theory and analysis. Randon.
Citazione stile Chigago Style (17a edizione)Eckhardt, Kenneth W., e Ermann,M.David. Social Research Methods: Perspective Theory and Analysis. New York: Randon, 1977.
Citatione MLA (9a ed.)Eckhardt, Kenneth W., e Ermann,M.David. Social Research Methods: Perspective Theory and Analysis. Randon, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.