Mary Bosticco. (1989). Personal Letters for Business People (Third Edition.). Wildwood House Limited.
Cita Chicago (17th ed.)Mary Bosticco. Personal Letters for Business People. Third Edition. Wildwood House Limited, 1989.
Cita MLA (8th ed.)Mary Bosticco. Personal Letters for Business People. Third Edition. Wildwood House Limited, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.