Cita APA (7a ed.)

Walker, C. E. (1975). Learn to relax: 13 ways to reduce tension. Prentice-Hall.

Cita Chicago Style (17a ed.)

Walker, C. Eugene. Learn to Relax: 13 Ways to Reduce Tension. Englewood Cliffs, New Jersey: Prentice-Hall, 1975.

Cita MLA (9a ed.)

Walker, C. Eugene. Learn to Relax: 13 Ways to Reduce Tension. Prentice-Hall, 1975.