reduces its effectiveness for secular purposes nor prevents adherents of other religions from observing their own holy days. See also Gregorian calendar Notes References Citations Works cited First-day Seventh-day Non-Sabbatarian Varying Further reading Cotton, John Paul. From Sabbath to Sunday: a study in early Christianity (1933) Land, Gary. Historical Dictionary of the Seventh-day Adventists (Rowman & Littlefield, 2014) Miller, Stephen, The Peculiar life of Sundays, (Harvard University Press, 2008.) External links The Lord's Day, the Christian Sabbath by James Chrystie - Reformed Presbyterian Church The Christian Week and Sabbath by Methodist theologian, Daniel D. Whedon Christian terminology Mosaic law in Christian theology Christianity Christian Sunday observances