Παραπομπή APA

Bull, G. M., & Packham, S. (1971). Time sharing systems. McGraw-Hill.

Παραπομπή Chicago Style

Bull, G M., και SFG Packham. Time Sharing Systems. London: McGraw-Hill, 1971.

Παραπομπή MLA

Bull, G M., και SFG Packham. Time Sharing Systems. McGraw-Hill, 1971.