Παραπομπή APA

Vendel, T. M., & Williams, W. H. (1969). Introduction to data processing and COBOL. McGraw-Hill.

Παραπομπή Chicago Style

Vendel, Thomas M., και William H. Williams. Introduction to Data Processing and COBOL. New York: McGraw-Hill, 1969.

Παραπομπή MLA

Vendel, Thomas M., και William H. Williams. Introduction to Data Processing and COBOL. McGraw-Hill, 1969.