APA-referens (7:e uppl.)
Willis, W. R. (1979). 200 years and still counting: Past, present and future of the sunday school. Victor Books.
Chicago-referens (17:e uppl.)
Willis, Wesley R. 200 Years and Still Counting: Past, Present and Future of the Sunday School. Illinois: Victor Books, 1979.
MLA-referens (9:e uppl.)
Willis, Wesley R. 200 Years and Still Counting: Past, Present and Future of the Sunday School. Victor Books, 1979.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.