Cita APA (7th ed.)

Poindexter, C. C., Valentine, D. P., & Conway, P. G. (1999). Essential skills for human services. Brooks/Cole.

Cita Chicago (17th ed.)

Poindexter, Cynthia Cannon, Deborah P. Valentine, i Patricia Gail Conway. Essential Skills for Human Services. Belmont, Calif: Brooks/Cole, 1999.

Cita MLA (9th ed.)

Poindexter, Cynthia Cannon, et al. Essential Skills for Human Services. Brooks/Cole, 1999.