APA (7e ed.) Bronvermelding

Gregory, A., Hartley, J., & Lewis, D. (1969). Basic statistics. Methuen.

Chicago (17e ed.) Bronvermelding

Gregory, A.H, J.R Hartley, en D.G Lewis. Basic Statistics. London: Methuen, 1969.

MLA (9e ed.) Bronvermelding

Gregory, A.H, et al. Basic Statistics. Methuen, 1969.