Language loyalty in the United States: The maintenance and perpetuation of non-English mother tongues by American ethnic and religious groups. By Joshua A. Fishman, and Vladimir C. Nahirny, John E. Hofman, Robert G. Hayden with the assistance of Mary E. Warshauer, Heinz Kloss, Herve B. Lemaire, Chester C. and Jane Christian, and Nathan Glazer, and with an Introduction by Einar Haugen. Janua Linguarum Series Maior 21. Mouton & Co., The Hague 1966. 478 pp.