Gough, D., Oliver, S., & Thomas, J. (2017). An introduction to systematic reviews (2nd edition.). SAGE.
Lua i Stíl Chicago (17ú heag.)Gough, David, Sandy Oliver, agus James Thomas. An Introduction to Systematic Reviews. 2nd edition. Los Angeles: SAGE, 2017.
Lua MLA (9ú heag.)Gough, David, et al. An Introduction to Systematic Reviews. 2nd edition. SAGE, 2017.
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