Cita APA (7th ed.)

Haggard, G., & Jones, W. O. (1985). Structured COBOL. D.C. Heath.

Cita Chicago (17th ed.)

Haggard, Gary, i Wendell O. Jones. Structured COBOL. Lexington, MA: D.C. Heath, 1985.

Cita MLA (9th ed.)

Haggard, Gary, i Wendell O. Jones. Structured COBOL. D.C. Heath, 1985.