Schoenberg, I. E. (1994). Focus on grammar: Teacher's manual. A basic course for reference and practice (1a. ed.). Addison-Wesley.
Citace podle Chicago (17th ed.)Schoenberg, Irene E. Focus on Grammar: Teacher's Manual. A Basic Course for Reference and Practice. 1a. ed. Reading: Addison-Wesley, 1994.
Citace podle MLA (9th ed.)Schoenberg, Irene E. Focus on Grammar: Teacher's Manual. A Basic Course for Reference and Practice. 1a. ed. Addison-Wesley, 1994.
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