Cita APA (7th ed.)
Rittel, H. W. Structure and Usefulness of Planning Information Systems. Universität Stuttgart, Institut fuer Grundlagen der Planung.
Cita Chicago (17th ed.)
Rittel, Horst W.J. Structure and Usefulness of Planning Information Systems. Stuttgart, Alemania: Universität Stuttgart, Institut fuer Grundlagen der Planung.
Cita MLA (9th ed.)
Rittel, Horst W.J. Structure and Usefulness of Planning Information Systems. Universität Stuttgart, Institut fuer Grundlagen der Planung.
Atenció: Aquestes cites poden no estar 100% correctes.