Cita APA

Eckstut-Didier, S., & Eckstut-Didier, S. (2012). Focus on grammar 2: [an integrated skills approach] (4. edition.). White Plains, N.Y.: Pearson.

Citación estilo Chicago

Eckstut-Didier, Samuela, y Samuela Eckstut-Didier. Focus On Grammar 2: [an Integrated Skills Approach]. 4. edition. White Plains, N.Y.: Pearson, 2012.

Cita MLA

Eckstut-Didier, Samuela, y Samuela Eckstut-Didier. Focus On Grammar 2: [an Integrated Skills Approach]. 4. edition. White Plains, N.Y.: Pearson, 2012.