Cita APA (7a ed.)

Arroyo, S. R. (1981). Business correspondence. Goodwill.

Cita Chicago Style (17a ed.)

Arroyo, Sandra Rodriguez. Business Correspondence. Manila: Goodwill, 1981.

Cita MLA (9a ed.)

Arroyo, Sandra Rodriguez. Business Correspondence. Goodwill, 1981.