Martin, R. (1963). Practical speech for Modern Business. Century coffe.
Citazione stile Chigago Style (17a edizione)Martin, Robinson. Practical Speech for Modern Business. Appleton: Century coffe, 1963.
Citatione MLA (9a ed.)Martin, Robinson. Practical Speech for Modern Business. Century coffe, 1963.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.