APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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