Bordens, K. S., & Abbott, B. B. (2011). Research design and methods: A process approach (8th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Bordens, Kenneth S., agus Bruce B. Abbott. Research Design and Methods: A Process Approach. 8th ed. New York: McGraw-Hill, 2011.
Lua MLA (9ú heag.)Bordens, Kenneth S., agus Bruce B. Abbott. Research Design and Methods: A Process Approach. 8th ed. McGraw-Hill, 2011.
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