Foster, J. J., & Parker, I. (1995). Carrying out investigations in psychology: Methods and statistics. BPS Books.
Lua i Stíl Chicago (17ú heag.)Foster, Jeremy J., agus Ian Parker. Carrying Out Investigations in Psychology: Methods and Statistics. Leicester, UK: BPS Books, 1995.
Lua MLA (9ú heag.)Foster, Jeremy J., agus Ian Parker. Carrying Out Investigations in Psychology: Methods and Statistics. BPS Books, 1995.
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