Nichols, R. G., & Stevens, L. A. (1957). Are you listening? (ed.). Mc Graw Hill Book Co..
Chicago-čujuhus (17. p.)Nichols, Ralph G., juo Leonard A. Stevens. Are You Listening? ed. New York: Mc Graw Hill Book Co., 1957.
MLA-čujuhus (9. p.)Nichols, Ralph G., juo Leonard A. Stevens. Are You Listening? ed. Mc Graw Hill Book Co., 1957.
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