Zitner, S. P. (1966). the practice of criticism. Scott, Foresman.
Lua i Stíl Chicago (17ú heag.)Zitner, Sheldon P. The Practice of Criticism. Chicago: Scott, Foresman, 1966.
Lua MLA (8ú heag.)Zitner, Sheldon P. The Practice of Criticism. Scott, Foresman, 1966.
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