ARYA,CANADA. (1989). HD BK OF BUSINESS LETTERS. KIRAN BOOK.
Cita Chicago (17th ed.)ARYA,CANADA. HD BK OF BUSINESS LETTERS. KIRAN BOOK, 1989.
Cita MLA (9th ed.)ARYA,CANADA. HD BK OF BUSINESS LETTERS. KIRAN BOOK, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.