Doyle, R. E. (1998). Essential skills and strategies in the helping process (2nd ed.). Brooks/Cole.
Citazione stile Chigago Style (17a edizione)Doyle, Robert E. Essential Skills and Strategies in the Helping Process. 2nd ed. Pacific Grove: Brooks/Cole, 1998.
Citatione MLA (9a ed.)Doyle, Robert E. Essential Skills and Strategies in the Helping Process. 2nd ed. Brooks/Cole, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.