Yepsen Jr, R. (1987). How to boost your brain power. Universal.
Chicago-čujuhus (17. p.)Yepsen Jr, Roger. How to Boost Your Brain Power. New Delhi: Universal, 1987.
MLA-čujuhus (9. p.)Yepsen Jr, Roger. How to Boost Your Brain Power. Universal, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.