Citazione Stile APA (7a Edizione)
Harrison, M. (1995). Grammar spectrum 2. English rules and practice: Pre-intermadiate. With answers. Oxford University Press.
Citazione stile Chigago Style (17a edizione)
Harrison, Mark. Grammar Spectrum 2. English Rules and Practice: Pre-intermadiate. With Answers. Oxford: Oxford University Press, 1995.
Citatione MLA (9a ed.)
Harrison, Mark. Grammar Spectrum 2. English Rules and Practice: Pre-intermadiate. With Answers. Oxford University Press, 1995.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.