Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Davis, William S., y Richard H. Fisher. COBOL: An Introduction to Structured Logic and Modular Program Design. Massachusetts [etc.]: Addison-Wesley Pu. Co, 1979.

Cita MLA (9a ed.)

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