Παραπομπή APA

Fisk, G. (1967). Marketing systems: An introductory analysis. Harper & Row.

Παραπομπή Chicago Style

Fisk, George. Marketing Systems: An Introductory Analysis. London: Harper & Row, 1967.

Παραπομπή MLA

Fisk, George. Marketing Systems: An Introductory Analysis. Harper & Row, 1967.