Cowan, E. M., Betz, A., & Charters, W. W. (1924). Essential language habits: Teachers' manual. Silver, Burdett & Co.
Chicago-viite (17. p.)Cowan, Esther Marshall, Annette Betz, ja W. W. Charters. Essential Language Habits: Teachers' Manual. New York, Newark [etc.]: Silver, Burdett & Co, 1924.
MLA-viite (8. p.)Cowan, Esther Marshall, et al. Essential Language Habits: Teachers' Manual. Silver, Burdett & Co, 1924.
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