↑ Steven, Daniel. “What is self-publishing”. publishlawyer.com. Daniel N. Steven, LLC. Truy cập ngày 1 tháng 3 năm 2018.
↑ Clapham, Michael, "Printing" in A History of Technology, Vol 2. From the Renaissance to the Industrial Revolution, edd. Charles Singer et al. (Oxford 1957), p. 377. Cited from Elizabeth L. Eisenstein, The Printing Press as an Agent of Change (Cambridge University, 1980).
