Lyman, R. L. V., Johnson, R. I., & Bear, M. V. (1934). Directed language practice. Ginn.
Lua i Stíl Chicago (17ú heag.)Lyman, Rollo La Verne, Roy Ivan Johnson, agus Mata Virginia Bear. Directed Language Practice. Boston: Ginn, 1934.
Lua MLA (8ú heag.)Lyman, Rollo La Verne, et al. Directed Language Practice. Ginn, 1934.
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