Cita APA (7a ed.)

O'Connell, S. (1991). Focus on Proficiency (2nd ed., 2nd reimpression.). CollinsELT.

Cita Chicago Style (17a ed.)

O'Connell, Sue. Focus on Proficiency. 2nd ed., 2nd reimpression. London: CollinsELT, 1991.

Cita MLA (9a ed.)

O'Connell, Sue. Focus on Proficiency. 2nd ed., 2nd reimpression. CollinsELT, 1991.