Harold B. Allen. (1965). Teaching English as a second language. New York: McGraw-Hill.
Stile di citazione ChicagoHarold B. Allen. Teaching English As a Second Language. New York: McGraw-Hill, 1965.
Citazione MLAHarold B. Allen. Teaching English As a Second Language. New York: McGraw-Hill, 1965.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.