Cita APA (7a ed.)

Cavallo, R. E. (1979). The role of systems methodology in social science research. Martinus Nijhoff.

Cita Chicago Style (17a ed.)

Cavallo, Roger E. The Role of Systems Methodology in Social Science Research. Boston [etc.]: Martinus Nijhoff, 1979.

Cita MLA (9a ed.)

Cavallo, Roger E. The Role of Systems Methodology in Social Science Research. Martinus Nijhoff, 1979.