Bürger, E., & Wittmar, G. (1969). Was ist - was soll: Datenverarbeitung (1.Auflage (1.- 12. Tausend).). Urania Verlag.
Citação do estilo Chicago (17ª ed.)Bürger, Erich, e Gerhard Wittmar. Was Ist - Was Soll: Datenverarbeitung. 1.Auflage (1.- 12. Tausend). Jena; Berlin: Urania Verlag, 1969.
Citação MLA (8ª ed.)Bürger, Erich, e Gerhard Wittmar. Was Ist - Was Soll: Datenverarbeitung. 1.Auflage (1.- 12. Tausend). Urania Verlag, 1969.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.