Johnson, D. W. (1978). The care and feeding of volunteers. Abingdon.
Dyfyniad Arddull ChicagoJohnson, Douglas W. The Care and Feeding of Volunteers. Nashville: Abingdon, 1978.
Dyfyniad MLAJohnson, Douglas W. The Care and Feeding of Volunteers. Abingdon, 1978.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.