Cita APA (7a ed.)

Lyon, W., & Duke, B. J. (1981). Introduction to human services. Reston Pub. Co.

Cita Chicago Style (17a ed.)

Lyon, William, y Bill J. Duke. Introduction to Human Services. Reston, Va: Reston Pub. Co, 1981.

Cita MLA (9a ed.)

Lyon, William, y Bill J. Duke. Introduction to Human Services. Reston Pub. Co, 1981.