Cita APA (7th ed.)

Davis, W. S., & Fisher, R. H. (1979). COBOL: An introduction to structured logic and modular program design. Addison-Wesley.

Cita Chicago (17th ed.)

Davis, William S., i Richard H. Fisher. COBOL: An Introduction to Structured Logic and Modular Program Design. Reading, Mass: Addison-Wesley, 1979.

Cita MLA (9th ed.)

Davis, William S., i Richard H. Fisher. COBOL: An Introduction to Structured Logic and Modular Program Design. Addison-Wesley, 1979.