Cita APA (7a ed.)

DACOSTA, S. STEP UP ! WITH GRAMMAR- 7. FRANK EDUCATIONAL AIDS.

Cita Chicago Style (17a ed.)

DACOSTA, STEPHEN. STEP UP ! WITH GRAMMAR- 7. NEW DELHI: FRANK EDUCATIONAL AIDS.

Cita MLA (9a ed.)

DACOSTA, STEPHEN. STEP UP ! WITH GRAMMAR- 7. FRANK EDUCATIONAL AIDS.