Cita APA (7a ed.)

Amsden, D. M., Butler, H. E., & Amsden, R. T. (1991). SPC simplified for services: Practical tools for continuous quality improvement. Quality Resources.

Cita Chicago Style (17a ed.)

Amsden, Davida M., Howard E. Butler, y Robert T. Amsden. SPC Simplified for Services: Practical Tools for Continuous Quality Improvement. New York: Quality Resources, 1991.

Cita MLA (9a ed.)

Amsden, Davida M., et al. SPC Simplified for Services: Practical Tools for Continuous Quality Improvement. Quality Resources, 1991.