Romanoff, M. R. (1991). Language and study skills for learners of English. Prentice Hall Regents.
Citazione stile Chigago Style (17a edizione)Romanoff, Marjorie R. Language and Study Skills for Learners of English. Englewood Cliffs, N.J: Prentice Hall Regents, 1991.
Citatione MLA (9a ed.)Romanoff, Marjorie R. Language and Study Skills for Learners of English. Prentice Hall Regents, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.