Royse, D. D. (1995). Research methods in social work (2nd ed.). Nelson-Hall.
Lua i Stíl Chicago (17ú heag.)Royse, David D. Research Methods in Social Work. 2nd ed. Chicago: Nelson-Hall, 1995.
Lua MLA (9ú heag.)Royse, David D. Research Methods in Social Work. 2nd ed. Nelson-Hall, 1995.
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