APA (7th ed.) Citation

Eckstut, S. (1994). Focus on grammar: Workbook. A basic course for reference and practice. Addison-Wesley.

Chicago Style (17th ed.) Citation

Eckstut, Samuela. Focus on Grammar: Workbook. A Basic Course for Reference and Practice. Massachusetts: Addison-Wesley, 1994.

MLA (9th ed.) Citation

Eckstut, Samuela. Focus on Grammar: Workbook. A Basic Course for Reference and Practice. Addison-Wesley, 1994.