Willis, W. R. (1979). 200 years and still counting: Past, present and future of the sunday school. Victor Books.
芝加哥风格引文Willis, Wesley R. 200 Years and Still Counting: Past, Present and Future of the Sunday School. Illinois: Victor Books, 1979.
MLA引文Willis, Wesley R. 200 Years and Still Counting: Past, Present and Future of the Sunday School. Victor Books, 1979.
警告：这些引文格式不一定是100％准确.