Riebel, J. P. (1953). How to write successful business letters in 15 days. Prentice-Hall.
Chicagoスタイル(17版)引用形式Riebel, John P. How to Write Successful Business Letters in 15 Days. New York: Prentice-Hall, 1953.
MLA(9版)引用形式Riebel, John P. How to Write Successful Business Letters in 15 Days. Prentice-Hall, 1953.
警告: この引用は必ずしも正確ではありません.