Παραπομπή APA

Christopher, M. (1972). Marketing below-the-line. George Allen & Unwin.

Παραπομπή Chicago Style

Christopher, Martin. Marketing Below-the-line. London: George Allen & Unwin, 1972.

Παραπομπή MLA

Christopher, Martin. Marketing Below-the-line. George Allen & Unwin, 1972.