APA (7e ed.) Bronvermelding

De los Reyes, R. A. (1991). Watch your business English!: A practical guidebook to over 800 concerns on correct usage in business correspondence. PROSEC.

Chicago (17e ed.) Bronvermelding

De los Reyes, Rodolfo A. Watch Your Business English!: A Practical Guidebook to over 800 Concerns on Correct Usage in Business Correspondence. Makati: PROSEC, 1991.

MLA (9e ed.) Bronvermelding

De los Reyes, Rodolfo A. Watch Your Business English!: A Practical Guidebook to over 800 Concerns on Correct Usage in Business Correspondence. PROSEC, 1991.