Dooley, D. (1995). Social research methods (3rd ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Dooley, David. Social Research Methods. 3rd ed. Englewood Cliffs, N.J: Prentice Hall, 1995.
Lua MLA (9ú heag.)Dooley, David. Social Research Methods. 3rd ed. Prentice Hall, 1995.
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