Cita APA (7a ed.)

Fritschi, E. K. (1947). Business letters in English (4th ed.). Langenscheidt.

Cita Chicago Style (17a ed.)

Fritschi, Emil Karl. Business Letters in English. 4th ed. Berlin: Langenscheidt, 1947.

Cita MLA (9a ed.)

Fritschi, Emil Karl. Business Letters in English. 4th ed. Langenscheidt, 1947.