Levitt, K. L., & Wharf, B. (1985). The Challenge of child welfare. University of British Columbia Press.
Dyfyniad Arddull ChicagoLevitt, Kenneth L., and Brian Wharf. The Challenge of Child Welfare. Vancouver: University of British Columbia Press, 1985.
Dyfyniad MLALevitt, Kenneth L., and Brian Wharf. The Challenge of Child Welfare. University of British Columbia Press, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.