Cita APA (7th ed.)

Barkley, L., & Sandoval, C. (2015). Grammar and usage, naturally. Cengage Learning.

Cita Chicago (17th ed.)

Barkley, Lawrence, i Christine Sandoval. Grammar and Usage, Naturally. Stamford, CT: Cengage Learning, 2015.

Cita MLA (9th ed.)

Barkley, Lawrence, i Christine Sandoval. Grammar and Usage, Naturally. Cengage Learning, 2015.