ARYA,CANADA. (1989). HD BK OF BUSINESS LETTERS. KIRAN BOOK.
Chicagoスタイル(17版)引用形式ARYA,CANADA. HD BK OF BUSINESS LETTERS. KIRAN BOOK, 1989.
MLA(9版)引用形式ARYA,CANADA. HD BK OF BUSINESS LETTERS. KIRAN BOOK, 1989.
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APA(7版)引用形式