Osbourne, C. (2015). Exam essentials practice tests cambridge english: first FCE: Completely updated for the 2015 exam specifications. United Kingdom: National Geographic learning;Cengage Learning.
Trích dẫn kiểu ChicagoOsbourne, Charles. Exam Essentials Practice Tests Cambridge English: First FCE: Completely Updated for the 2015 Exam Specifications. United Kingdom: National Geographic learning;Cengage Learning, 2015.
MLA引文Osbourne, Charles. Exam Essentials Practice Tests Cambridge English: First FCE: Completely Updated for the 2015 Exam Specifications. United Kingdom: National Geographic learning;Cengage Learning, 2015.
警告：這些引文格式不一定是100％准確.