Krashen, S. D. (1984). Writing: Research, theroy and applications. Pergamon Institute of English.
Citazione stile Chigago Style (17a edizione)Krashen, Stphen D. Writing: Research, Theroy and Applications. Oxford: Pergamon Institute of English, 1984.
Citatione MLA (9a ed.)Krashen, Stphen D. Writing: Research, Theroy and Applications. Pergamon Institute of English, 1984.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.