Cita APA (7a ed.)

Sayad, B. W., & Sayad, B. W. (1997). An invitation to health: The power of prevention (7th ed.). Brooks/Cole Pub..

Cita Chicago Style (17a ed.)

Sayad, Barbara W., y Barbara Werner Sayad. An Invitation to Health: The Power of Prevention. 7th ed. Pacific Grove, CA: Brooks/Cole Pub., 1997.

Cita MLA (8a ed.)

Sayad, Barbara W., y Barbara Werner Sayad. An Invitation to Health: The Power of Prevention. 7th ed. Brooks/Cole Pub., 1997.