Citazione Stile APA (7a Edizione)

Kellman, R. (1947). English and portuguese commercial correspondence (4.ed.). Nacional São Paulo Editora.

Citazione stile Chigago Style (17a edizione)

Kellman, Rudyard. English and Portuguese Commercial Correspondence. 4.ed. São Paulo, SP: Nacional São Paulo Editora, 1947.

Citatione MLA (9a ed.)

Kellman, Rudyard. English and Portuguese Commercial Correspondence. 4.ed. Nacional São Paulo Editora, 1947.