Individual languages have had various orthographies, usually based on either the Lepsius alphabet or on the Latin alphabet. They may change over time or between countries. Latin letters, such as ⟨c⟩ ⟨x⟩ ⟨q⟩ ⟨ç⟩, have case forms; the pipe letters ⟨ǀ⟩ ⟨ǁ⟩ ⟨ǃ⟩ ⟨ǂ⟩ do not.[7]
^Lepsius, C. R. (1855). Das allgemeine linguistische Alphabet: Grundsätze der Übertragung fremder Schriftsysteme und bisher noch ungeschriebener Sprachen in europäische Buchstaben. Berlin: Verlag von Wilhelm Hertz.
^Lepsius, C. R. (1863). Standard Alphabet for Reducing Unwritten Languages and Foreign Graphic Systems to a Uniform Orthography in European Letters (2nd ed.). London/Berlin.{{cite book}}: CS1 maint: location missing publisher (link)
^Bleek, Wilhelm. A Comparative Grammar of South African Languages. Vol. (1862: Part I, 1869: Part II). London: Trübner & Co.