Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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