Center for Research and Documentation on World Language Problems. (1977). Language Problems and Language Planning. University of Texas Press.
Citação do estilo Chicago (17ª ed.)Center for Research and Documentation on World Language Problems. Language Problems and Language Planning. Austin, Tex: University of Texas Press, 1977.
Citação MLA (8ª ed.)Center for Research and Documentation on World Language Problems. Language Problems and Language Planning. University of Texas Press, 1977.
警告：這些引文格式不一定是100％准確.