Roberts wrote and published numerous articles, pamphlets and books. A series of 12 lectures, given in Huddersfield in 1861, formed the basis of his first book. Each lecture was published sequentially at fortnightly intervals, in penny numbers. The second edition (February 1862), entitled "Twelve Lectures", was stitched together in one volume. Expanded to 18 lectures, the book was republished by Robert Roberts in 1884, as "Christendom Astray From the Bible". From its first publication as 12 lectures, "Christendom Astray" was acknowledged by Christadelphians as a standard work putting forth their beliefs; it has now been in print for almost 146 years in several editions. In 1867, from the manuscript of R.C. Bingley of Chicago, he published "The Declaration", a standard work used for many years.