Perkins, D., & Perkins, J. (1989). Business letters: Made to measure ; (business letters instantly). Domino Books.
Chicago-Zitierstil (17. Ausg.)Perkins, Derek, und Joan Perkins. Business Letters: Made to Measure ; (business Letters Instantly). St. John's: Domino Books, 1989.
MLA-Zitierstil (9. Ausg.)Perkins, Derek, und Joan Perkins. Business Letters: Made to Measure ; (business Letters Instantly). Domino Books, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.