Levin, R. I., & Kirkpatrick, C. A. (1966). Planning and control with PERT/CPM. McGraw-Hill ; Tata McGraw-Hill.

Levin, Richard I., and Charles Atkinson Kirkpatrick. Planning and Control with PERT/CPM. New York ; New Delhi: McGraw-Hill ; Tata McGraw-Hill, 1966.

Levin, Richard I., and Charles Atkinson Kirkpatrick. Planning and Control with PERT/CPM. McGraw-Hill ; Tata McGraw-Hill, 1966.