An Introduction to Language. 3rd ed. By Victoria Fromkin and Robert Rodman. New York: Holt,Rinehart,and Winston,1983. ix + 385. Language: An Introduction. By Winfred P. Lehmann. New York: Random House,1983. xii + 241

Lehmann, Winfred P. 1972. Descriptive Linguistics: An Introduction. New York: Random House. 2nd ed., 1976.

McMillan, James B. 1977. A Controversial Consonant. American Speech 52:84-97.