Cita APA (7th ed.)

Kunz, W., & Rittel, H. (1970). Issues as elements of information systems. Institute of Urban & Regional Development.

Cita Chicago (17th ed.)

Kunz, Werner, i Horst Rittel. Issues as Elements of Information Systems. [Berkeley: Institute of Urban & Regional Development, 1970.

Cita MLA (9th ed.)

Kunz, Werner, i Horst Rittel. Issues as Elements of Information Systems. Institute of Urban & Regional Development, 1970.