kelly, R. (1971). The use of English for Technical students. The English language book society.
Citazione stile Chigago Style (17a edizione)kelly, R. The Use of English for Technical Students. NULL: The English language book society, 1971.
Citatione MLA (9a ed.)kelly, R. The Use of English for Technical Students. The English language book society, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.