APA

Harper R., . (1986). Mailing List Strategies, A guide to Direct Mail Success. New York, Estados Unidos: McGraw Hill.

Chicago

Harper Rose, . 1986. Mailing List Strategies, A guide to Direct Mail Success. New York, Estados Unidos: McGraw Hill.

Harvard

Harper R., . (1986). Mailing List Strategies, A guide to Direct Mail Success. New York, Estados Unidos: McGraw Hill.

MLA

Harper Rose, . Mailing List Strategies, A guide to Direct Mail Success. New York, Estados Unidos: McGraw Hill. 1986.