Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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