Lugton, R. C. (1970). English as a second language: Current issues. Center for Curriculum Development.
Cita Chicago (17th ed.)Lugton, Robert C. English as a Second Language: Current Issues. Philadelphia, Pa: Center for Curriculum Development, 1970.
Cita MLA (9th ed.)Lugton, Robert C. English as a Second Language: Current Issues. Center for Curriculum Development, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.