Dyfyniad APA

Koch, R. S., & Kolse, K. S. (2000). Focus on grammar: An advanced course for reference and practice : workbook. White Plains, NY: Addison-Wesley Longman.

Dyfyniad Arddull Chicago

Koch, Rachel Spack, và Keith S. Kolse. Focus On Grammar: An Advanced Course for Reference and Practice : Workbook. White Plains, NY: Addison-Wesley Longman, 2000.

Dyfyniad MLA

Koch, Rachel Spack, và Keith S. Kolse. Focus On Grammar: An Advanced Course for Reference and Practice : Workbook. White Plains, NY: Addison-Wesley Longman, 2000.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.