O'Grady William, Dobrovolsky Michael, & Katamba Francis. (1997). Contemporary linguistic: An introduction. Pearson education ltd..
Citazione stile Chigago Style (17a edizione)O'Grady William, Dobrovolsky Michael, e Katamba Francis. Contemporary Linguistic: An Introduction. Harlow: Pearson education ltd., 1997.
Citatione MLA (9a ed.)O'Grady William, et al. Contemporary Linguistic: An Introduction. Pearson education ltd., 1997.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.