Tessen Freund: Software Engineering durch Modellierung wissensintensiver Entwicklungsprozesse. ISBN 978-3-940019-11-0, Kap. 2.1.1 „Software“, S. 25. Zitat Edmunds: „Software includes computer programs and data that is used by theses programs […] Software determines what a computer does and how it does it.“ google-books
