University of Illinois (Urbana-Champaign campus), Elementary School Science Project, Atkin, J. M., & Wyatt, S. P. (1969). The University of Illinois astronomy program. Harper & Row.
Chicago-referens (17:e uppl.)University of Illinois (Urbana-Champaign campus), Elementary School Science Project, J. Myron Atkin, och Stanley P. Wyatt. The University of Illinois Astronomy Program. New York: Harper & Row, 1969.
MLA-referens (8:e uppl.)University of Illinois (Urbana-Champaign campus), et al. The University of Illinois Astronomy Program. Harper & Row, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.