APA (7e ed.) Bronvermelding

Spurr, W. A. (1961). Business and economic statistics (Rev, [i.e. 2d].). Irwin.

Chicago (17e ed.) Bronvermelding

Spurr, William Alfred. Business and Economic Statistics. Rev, [i.e. 2d]. Homewood, Illinois: Irwin, 1961.

MLA (9e ed.) Bronvermelding

Spurr, William Alfred. Business and Economic Statistics. Rev, [i.e. 2d]. Irwin, 1961.