Cottle, Morris and Cottle, Shirley. 1958. The Significant Sounds of Ivatan. (In Studies in Philippine linguistics; Oceania Linguistic Monographs, 3.) Sydney: University of Sydney. 24–33pp.
@book{cottlecottle1958, address = {Sydney}, author = {Cottle, Morris and Cottle, Shirley}, pages = {24–33}, publisher = {University of Sydney}, series = {In Studies in Philippine linguistics; Oceania Linguistic Monographs}, title = {The Significant Sounds of Ivatan}, volume = {3}, year = {1958} }