APA (7th ed.) Citation

Graduate Management Admission Council. (2017). GMAT official guide 2018: The definitive guide from the makers of the GMAT exam. Graduate Management Admission Council.

Chicago Style (17th ed.) Citation

Graduate Management Admission Council. GMAT Official Guide 2018: The Definitive Guide from the Makers of the GMAT Exam. Hoboken, New Jersey: Graduate Management Admission Council, 2017.

MLA (9th ed.) Citation

Graduate Management Admission Council. GMAT Official Guide 2018: The Definitive Guide from the Makers of the GMAT Exam. Graduate Management Admission Council, 2017.