Cita APA (7th ed.)

Orr, K. T., & Warnier, J. D. (1977). Structured systems development. Yourdon.

Cita Chicago (17th ed.)

Orr, Kenneth T., i J. D. Warnier. Structured Systems Development. Nueva York: Yourdon, 1977.

Cita MLA (9th ed.)

Orr, Kenneth T., i J. D. Warnier. Structured Systems Development. Yourdon, 1977.