Leviton, R. (1995). Brain builders: A life long guide to sharper thinking, better memory and an age proof mind.
استشهاد بنمط شيكاغوLeviton, Richard. Brain Builders: A Life Long Guide to Sharper Thinking, Better Memory and an Age Proof Mind. New Jersey, Prentice Hall, 1995.
MLA استشهادLeviton, Richard. Brain Builders: A Life Long Guide to Sharper Thinking, Better Memory and an Age Proof Mind. 1995.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.