Casad, E. H. (1974). Dialect, intelligibility, testing. University of Oklahoma.
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Chicago-čujuhus (17. p.)
Casad, Eugene H. Dialect, Intelligibility, Testing. Norman, USA: University of Oklahoma, 1974.
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MLA-čujuhus (9. p.)
Casad, Eugene H. Dialect, Intelligibility, Testing. University of Oklahoma, 1974.
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