Gaya APA

Lewis, D. (1982). Thinking Better : a revolutionary new program to achieve peak mental performance the psychologists'clinically tested five-step method . America: Rawson, Wade Publishers.

Gaya MLA

Lewis, David. "Thinking Better : a revolutionary new program to achieve peak mental performance the psychologists'clinically tested five-step method". America: Rawson, Wade Publishers, 1982. Text.