Psychology, Hardcover by Gray, Peter; Bjorklund, David F., ISBN 1464141959, ISBN-13 9781464141959, Used Good Condition, Free shipping in the US Peter Gray’s evolutionary perspective and emphasis on critical thinking have made his rigorous yet accessible introduction to psychology a widely respected classroom favourite. Now thoroughly revised, with the help of new co-author David Bjorklund, Psychology, Seventh Edition, invites students to investigate the big ideas in psychological science.