Cita APA (7th ed.)

Collins. (2011). CollinsEasy Learning Spanish Grammar. HarperCollins Publishers.

Cita Chicago (17th ed.)

Collins. CollinsEasy Learning Spanish Grammar. Great Britain: HarperCollins Publishers, 2011.

Cita MLA (9th ed.)

Collins. CollinsEasy Learning Spanish Grammar. HarperCollins Publishers, 2011.