Παραπομπή APA

Willsmer, R. L. (1971). Directing the marketing effort. Staples.

Παραπομπή Chicago Style

Willsmer, Ray L. Directing the Marketing Effort. London: Staples, 1971.

Παραπομπή MLA

Willsmer, Ray L. Directing the Marketing Effort. Staples, 1971.