Goldratt, E.M., 1992. The Goal: A Process of Ongoing Improvement(2nd rev. edn). Great Barrington, MA: North River Press Publishing Corporation.
Goldratt, E.M., 1997. Critical Chain. Great Barrington, MA: North River Press Publishing Corporation.
The law states that 'work expands so as to fill the time available for its completion'. See: Parkinson, C. N., 1958, Parkinson's Law: The Pursuit of Progress, London: John Murray; and Parkinson, C. N., 1978. The Law of Delay: Interviews and Outerviews, London: Penguin Books.