Não informado. (1997). Professional School Counseling. American School Counselor Association.
Citação do estilo Chicago (17ª ed.)Não informado. Professional School Counseling. Alexandria, Va: American School Counselor Association, 1997.
Citação MLA (8ª ed.)Não informado. Professional School Counseling. American School Counselor Association, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.