Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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