2004, Thomas E. Getzen, “Management and Regulation of Hospital Costs”, in Health Economics: Fundamentals and Flow of Funds, New York, N.Y.: John Wiley & Sons, page 182
2011 June, “V and Y Productions: Some Help from BPP”, in CIMA Professional Competence Level Paper T4: Test of Professional Competence in Management: For Exams in 2011 and 2012, 2nd edition, London: BPP Learning Media, part C (Practice T4 (TOPCIMA) Cases), paragraph 65, page 352