Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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