Thomas Paine (1830). “Brief sketch of the life of Thomas Paine. Common sense. Epistle to Quakers. The crisis. Public good. Letter to the Abbe Raynal. Dissertations on government, the affairs of the bank, and paper money. Miscellaneous”, p.404
Sol LeWitt (2006). “Sol LeWitt wall drawing 1176: seven basic colors and all their combinations in a square within a square : for Josef Albers”, Richter Verlag