Illinois Press). 1956, 49 (3). (原始内容 (PDF)存档于2010-08-06). Anonymous. Hall Braille Writer. American Printing House for the Blind, Inc. 24 April 2011 [29 February
(原始内容存档于2021-03-11) Hall, Robert A. Jr. Italian phonemes and orthography. Italica (American Association of Teachers of Italian). 1944, 21 (2): 72–82. JSTOR 475860
ISBN 0-521-09838-6 Hall, Robert A. Jr. Italian phonemes and orthography. Italica (American Association of Teachers of Italian). 1944, 21 (2): 72–82. JSTOR 475860