Cita APA

James, R., & Ric James. (2007). Letter perfect. Columbus, Ohio: SRA/McGraw-Hill.

Chicago Style Citation

James, Ric, i Ric James. Letter Perfect. Columbus, Ohio: SRA/McGraw-Hill, 2007.

Cita MLA

James, Ric, i Ric James. Letter Perfect. Columbus, Ohio: SRA/McGraw-Hill, 2007.

Atenció: Aquestes cites poden no estar 100% correctes.