Cita APA (7th ed.)

Maurer, J. (2000). Focus on grammar: An advanced course for reference and practice (2a. ed.). Pearson Education.

Cita Chicago (17th ed.)

Maurer, Jay. Focus on Grammar: An Advanced Course for Reference and Practice. 2a. ed. Nueva York: Pearson Education, 2000.

Cita MLA (9th ed.)

Maurer, Jay. Focus on Grammar: An Advanced Course for Reference and Practice. 2a. ed. Pearson Education, 2000.