Não informado. (1961). Counselor Education and Supervision. American Association for Counseling and Development.
Citação do estilo Chicago (17ª ed.)Não informado. Counselor Education and Supervision. Alexandria, Va: American Association for Counseling and Development, 1961.
Citação MLA (8ª ed.)Não informado. Counselor Education and Supervision. American Association for Counseling and Development, 1961.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.