Sounds. Ann Arbor: University of Michigan Press. Pullum, Geoffrey K.; & Ladusaw, William A. (1986). Phonetic Symbol Guide. Chicago: University of Chicago Press. . Sweet, Henry. (1880–1881). Sound Notation. Transactions of the Philological Society, 177-235. Sweet, Henry. (1971). The Indispensable Foundation: A Selection from the Writings of Henry Sweet. Henderson, Eugénie J. A. (Ed.). Language and Language Learning 28. London: Oxford University Press. References de:Lautschrift