Παραπομπή APA

Zeisel, H. (1947). Say it with figures (5th ed.). Harper & Row.

Παραπομπή Chicago Style

Zeisel, Hans. Say It with Figures. 5th ed. New York: Harper & Row, 1947.

Παραπομπή MLA

Zeisel, Hans. Say It with Figures. 5th ed. Harper & Row, 1947.