Fillit, H., & Butler, R. N. (1997). Cognitive decline: Strategies for prevention (2nd ed.). Greenwich Medical Media : Distributed by Oxford University Press.

Fillit, Howard, and Robert N. Butler. Cognitive Decline: Strategies for Prevention. 2nd ed. London: Greenwich Medical Media : Distributed by Oxford University Press, 1997.

Fillit, Howard, and Robert N. Butler. Cognitive Decline: Strategies for Prevention. 2nd ed. Greenwich Medical Media : Distributed by Oxford University Press, 1997.