Polgar, S., & Thomas, S. A. (2000). Introduction to research in the health sciences (4th ed.). Churchill Livingstone.
Lua i Stíl Chicago (17ú heag.)Polgar, Stephen, agus Shane A. Thomas. Introduction to Research in the Health Sciences. 4th ed. Edinburgh: Churchill Livingstone, 2000.
Lua MLA (9ú heag.)Polgar, Stephen, agus Shane A. Thomas. Introduction to Research in the Health Sciences. 4th ed. Churchill Livingstone, 2000.
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