Cita APA (7a ed.)

Fuchs, M., Bonner, M., & Westheimer, M. (2000). Focus on grammar: An Intermediate course for reference and practice : answer key (2da. ed.). Longman.

Cita Chicago Style (17a ed.)

Fuchs, Marjorie, Margaret Bonner, y Miriam Westheimer. Focus on Grammar: An Intermediate Course for Reference and Practice : Answer Key. 2da. ed. New York: Longman, 2000.

Cita MLA (8a ed.)

Fuchs, Marjorie, et al. Focus on Grammar: An Intermediate Course for Reference and Practice : Answer Key. 2da. ed. Longman, 2000.