Allen, E. F. How to write and speak effective english. A modern guide to good form.
Citazione stile Chigago Style (17a edizione)Allen, Edward Frank. How to Write and Speak Effective English. A Modern Guide to Good Form.
Citatione MLA (8a ed.)Allen, Edward Frank. How to Write and Speak Effective English. A Modern Guide to Good Form.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.