APA-referens (7:e uppl.)

Lewis, D. G. (1968). Experimental design in education. University of London P..

Chicago-referens (17:e uppl.)

Lewis, D. G. Experimental Design in Education. London: University of London P., 1968.

MLA-referens (8:e uppl.)

Lewis, D. G. Experimental Design in Education. University of London P., 1968.