Cita APA (7th ed.)

Yourdon, E., Gane, C., Sarson, T., & Lister, T. R. (1978). Learning to program in structured COBOL. Yourdon.

Cita Chicago (17th ed.)

Yourdon, Edward, Chris Gane, Trish Sarson, i Timothy R. Lister. Learning to Program in Structured COBOL. Nueva York: Yourdon, 1978.

Cita MLA (9th ed.)

Yourdon, Edward, et al. Learning to Program in Structured COBOL. Yourdon, 1978.