Farol, H. F. (1987). A manual 0f effective business correspondence. University Book Supply.
Citazione stile Chigago Style (17a edizione)Farol, Honesto F. A Manual 0f Effective Business Correspondence. Manila: University Book Supply, 1987.
Citatione MLA (9a ed.)Farol, Honesto F. A Manual 0f Effective Business Correspondence. University Book Supply, 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.