Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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