Cita APA (7a ed.)

Rich, A. R., & Dahlheimer, D. (1989). The power of negative thinking: A new perspective on irrational cognitions. [s.n.].

Cita Chicago Style (17a ed.)

Rich, Alexander R., y David Dahlheimer. The Power of Negative Thinking: A New Perspective on Irrational Cognitions. [S.l.]: [s.n.], 1989.

Cita MLA (9a ed.)

Rich, Alexander R., y David Dahlheimer. The Power of Negative Thinking: A New Perspective on Irrational Cognitions. [s.n.], 1989.