APA

Pellegrino E. D., Edmund D. Pellegrino y David C. Thomasma & Thomasma D. C. (1997). Helping and healing. Washington: Georgetown University Press.

Chicago

Pellegrino Edmund D, Edmund D. Pellegrino y David C. Thomasma and Thomasma David C. 1997. Helping and healing. Washington: Georgetown University Press.

Harvard

Pellegrino E. D., Edmund D. Pellegrino y David C. Thomasma and Thomasma D. C. (1997). Helping and healing. Washington: Georgetown University Press.

MLA

Pellegrino Edmund D, Edmund D. Pellegrino y David C. Thomasma and Thomasma David C. Helping and healing. Washington: Georgetown University Press. 1997.