Cita APA (7a ed.)
Kral, T. (1994). Twelve famous americans: Reading and listening skills text for students of english as a foreign language (Edición revisada.). United States Information Agency.
Cita Chicago Style (17a ed.)
Kral, Thomas. Twelve Famous Americans: Reading and Listening Skills Text for Students of English as a Foreign Language. Edición revisada. Washington, D.C.: United States Information Agency, 1994.
Cita MLA (9a ed.)
Kral, Thomas. Twelve Famous Americans: Reading and Listening Skills Text for Students of English as a Foreign Language. Edición revisada. United States Information Agency, 1994.
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