Dyfyniad APA

Leiderman, R. (1990). The telephone book: How to find get,keep and develop customers. McGraw Hill.

Dyfyniad Arddull Chicago

Leiderman, Robert. The Telephone Book: How to Find Get,keep and Develop Customers. London: McGraw Hill, 1990.

Dyfyniad MLA

Leiderman, Robert. The Telephone Book: How to Find Get,keep and Develop Customers. McGraw Hill, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.