Peterson's. (2007). peterson's master toefl writing skills: Boost your toefl score! (First edition.). Peterson's.
Citazione stile Chigago Style (17a edizione)Peterson's. Peterson's Master Toefl Writing Skills: Boost Your Toefl Score! First edition. Lawrenceville, NJ: Peterson's, 2007.
Citatione MLA (9a ed.)Peterson's. Peterson's Master Toefl Writing Skills: Boost Your Toefl Score! First edition. Peterson's, 2007.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.