DeJong, C. R., Hilton, T., Monette, D. R., & Sullivan, T. J. Applied social research: A tool for the human services (Ninth edition.).

DeJong, Cornell R., Timothy Hilton, Duane R. Monette, و Thomas J. Sullivan. Applied Social Research: A Tool for the Human Services. Ninth edition.

DeJong, Cornell R., Timothy Hilton, Duane R. Monette, و Thomas J. Sullivan. Applied Social Research: A Tool for the Human Services. Ninth edition.