Cita APA (7a ed.)
Dean, M. Opportunities: Intermediate : Language Powerbook. Pearson.
Cita estilo Chicago (17a ed.)
Dean, Michael. Opportunities: Intermediate : Language Powerbook. Harlow, Inglaterra: Pearson.
Cita MLA (9a ed.)
Dean, Michael. Opportunities: Intermediate : Language Powerbook. Pearson.
警告：這些引文格式不一定是100％准確.