Citazione Stile APA (7a Edizione)

Willis, W. R. (1979). 200 years and still counting: Past, present and future of the sunday school. Victor Books.

Citazione stile Chigago Style (17a edizione)

Willis, Wesley R. 200 Years and Still Counting: Past, Present and Future of the Sunday School. Illinois: Victor Books, 1979.

Citatione MLA (9a ed.)

Willis, Wesley R. 200 Years and Still Counting: Past, Present and Future of the Sunday School. Victor Books, 1979.