APA (7th ed.) Citation

Christopher, W. F. (1985). Productivity measurement handbook (2nd ed.). Productivity press.

Chicago Style (17th ed.) Citation

Christopher, William F. Productivity Measurement Handbook. 2nd ed. Cambridge, Massachusetts [etc.]: Productivity press, 1985.

MLA (9th ed.) Citation

Christopher, William F. Productivity Measurement Handbook. 2nd ed. Productivity press, 1985.