Não informado. (1958). Journal of Speech and Hearing Research. American Speech-Language-Hearing Association.
Citação do estilo Chicago (17ª ed.)Não informado. Journal of Speech and Hearing Research. Rockville, Md: American Speech-Language-Hearing Association, 1958.
Citação MLA (8ª ed.)Não informado. Journal of Speech and Hearing Research. American Speech-Language-Hearing Association, 1958.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.