Fearnsides, W., & Bulman, O. (1966). The psychology of human ageing. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Fearnsides, W.G, agus O.M.B Bulman. The Psychology of Human Ageing. Harmondsworth, Middlesex, England: Penguin Books, 1966.
Lua MLA (8ú heag.)Fearnsides, W.G, agus O.M.B Bulman. The Psychology of Human Ageing. Penguin Books, 1966.
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