Fisher, D. (1963). Graded comprehension for advanced students. Longman.
Citazione stile Chigago Style (17a edizione)Fisher, David. Graded Comprehension for Advanced Students. London: Longman, 1963.
Citatione MLA (9a ed.)Fisher, David. Graded Comprehension for Advanced Students. Longman, 1963.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.