Cita APA (7th ed.)

Grauer, R. T. (1981). A COBOL book of practice and reference. Prentice-Hall.

Cita Chicago (17th ed.)

Grauer, Robert T. A COBOL Book of Practice and Reference. Englewood Cliffs, N.J.: Prentice-Hall, 1981.

Cita MLA (8th ed.)

Grauer, Robert T. A COBOL Book of Practice and Reference. Prentice-Hall, 1981.